56 results match your criteria Canadian Journal Of Animal Science[Journal]


A genetic evaluation of growth, ultrasound, and carcass traits at alternative slaughter endpoints in crossbred heavy lambs.

J Anim Sci 2019 Feb;97(2):521-535

Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada.

Genetic parameters were estimated for growth, ultrasound, and carcass traits in a Canadian crossbred heavy lamb population. Traits analyzed included birth, weaning, post-weaning, and ultrasound scanning weights; pre- and post-weaning average daily gain; ultrasonically measured eye muscle and fat depths; hot carcass weight; fat depth at the GR site (110 mm from the midline on the 12th rib); carcass conformation scores; saleable meat yield; price grid value; and total carcass value. The impact of three alternative slaughter endpoints (slaughter age, carcass weight, and carcass fatness) on genetic parameter estimates was also evaluated. Read More

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http://dx.doi.org/10.1093/jas/sky455DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358225PMC
February 2019
1 Read

Estimation of direct and maternal genetic parameters for individual birth weight, weaning weight, and probe weight in Yorkshire and Landrace pigs.

J Anim Sci 2018 Jun;96(7):2567-2578

Department of Animal Biosciences, Centre for Genetic Improvement of Livestock, University of Guelph, Guelph, Ontario, Canada.

As a result of selecting for increased litter size, newborn piglets are being born lighter and have a lower chance of survival. Raising fewer pigs to market weight would have a negative impact on the industry and farmer profitability; thus, understanding the genetics of individual growth performance traits will determine whether these traits will play an important role in pig breeding schemes. This study aimed to estimate genetic parameters for individual birth weight (BW), weaning weight (WW), and probe weight (PW) in Canadian-purebred Yorkshire and Landrace pigs. Read More

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https://academic.oup.com/jas/article/96/7/2567/4995455
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http://dx.doi.org/10.1093/jas/sky172DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6095450PMC
June 2018
1 Read

Genetic and phenotypic parameters for litter size, survival rate, gestation length, and litter weight traits in American mink.

J Anim Sci 2018 Jun;96(7):2596-2606

Department of Animal Science and Aquaculture, Dalhousie University, Truro, Nova Scotia, Canada.

The economic efficiency of mink production is greatly influenced by reproductive performance. Therefore, the objective of this study was to estimate phenotypic and genetic parameters for reproduction traits including total number of kits born (TB), number of live kits at birth (LB), number of live kits at weaning (LW), survival rate at birth (SB), survival rate at weaning (SW), gestation length (GL), average kit weight per litter at birth (AWB), average kit weight per litter at week 3 (AW3), and average kit weight per litter at weaning (AWW) in American mink. Data included records of 3,046 litters collected by the Canadian Centre for Fur Animal Research at Dalhousie Faculty of Agriculture between 2002 and 2016. Read More

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http://dx.doi.org/10.1093/jas/sky178DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6095447PMC
June 2018
10 Reads

Live growth performance, carcass grading characteristics, and harvest yields of beef steers supplemented zilpaterol hydrochloride and offered ad libitum or maintenance energy intake.

J Anim Sci 2018 May;96(5):1688-1703

Beef Carcass Research Center - Department of Agricultural Sciences, West Texas A&M University, Canyon, TX.

A trial was conducted to examine live growth efficiency, harvest yields, and carcass grading performance of steers fed at maintenance (M) or at ad libitum (A) level of intake during zilpaterol hydrochloride (Z) supplementation. Single-sired, beef steers (n = 56; start of trial BW 590 ± 36 kg) blocked (n = 2) by weight and terminal implant were sorted into pairs (n = 14 per block) by weight. Pairs of steers were initially assigned to 0, 28, or 56 d of feeding. Read More

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http://dx.doi.org/10.1093/jas/sky105DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6140836PMC
May 2018
4 Reads

Development and validation of a small SNP panel for feed efficiency in beef cattle.

J Anim Sci 2018 Mar;96(2):375-397

Livestock Gentec at University of Alberta, Edmonton, AB, Canada.

The objective of this study was to develop and validate a customized cost-effective single nucleotide polymorphism (SNP) panel for genetic improvement of feed efficiency in beef cattle. The SNPs identified in previous association studies and through extensive analysis of candidate genomic regions and genes, were screened for their functional impact and allele frequency in Angus and Hereford breeds used as validation candidates for the panel. Association analyses were performed on genotypes of 159 SNPs from new samples of Angus (n = 160), Hereford (n = 329), and Angus-Hereford crossbred (n = 382) cattle using allele substitution and genotypic models in ASReml. Read More

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http://dx.doi.org/10.1093/jas/sky020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6140863PMC

Nutritive value of multienzyme supplemented cold-pressed camelina cake for pigs.

J Anim Sci 2018 Apr;96(3):1119-1129

Department of Animal Science, South Dakota State University, Brookings, SD.

Cold-pressed camelina cake (CPCC) is a fibrous co-product of camelina seed pressing and available for livestock feeding. However, information is lacking on the effect of supplementing fiber-degrading enzymes to CPCC-based diets on nutrient utilization by pigs. Experiment 1 determined the effect of multienzyme supplementation on standardized ileal digestibility (SID) of amino acid (AA) and net energy (NE) value of CPCC for pigs. Read More

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http://dx.doi.org/10.1093/jas/skx025DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6093545PMC
April 2018
1 Read

Modeling heterotic effects in beef cattle using genome-wide SNP-marker genotypes.

J Anim Sci 2018 Apr;96(3):830-845

Livestock Gentec, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.

An objective of commercial beef cattle crossbreeding programs is to simultaneously optimize use of additive (breed differences) and non-additive (heterosis) effects. A total of 6,794 multibreed and crossbred beef cattle with phenotype and Illumina BovineSNP50 genotype data were used to predict genomic heterosis for growth and carcass traits by applying two methods assumed to be linearly proportional to heterosis. The methods were as follows: 1) retained heterozygosity predicted from genomic breed fractions (HET1) and 2) deviation of adjusted crossbred phenotype from midparent value (HET2). Read More

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http://dx.doi.org/10.1093/jas/skx002DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6093554PMC
April 2018
2 Reads

Effect of timing of subcutaneous meloxicam administration on indicators of pain after knife castration of weaned calves.

J Anim Sci 2017 Dec;95(12):5218-5229

The newly revised Canadian Codes of Practice for the management of beef cattle requires that as of 2018, calves older than 6 mo of age be castrated using pain control. Castration is a husbandry procedure commonly done without pain control, and there is a lack of agreement on an effective pain mitigation strategy specific to castration. The aim of this study was to identify the optimal time of administration of meloxicam prior to castration. Read More

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http://dx.doi.org/10.2527/jas2017.1978DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6292310PMC
December 2017
9 Reads

Phenotypic and genetic correlations of fatty acid composition in subcutaneous adipose tissue with carcass merit and meat tenderness traits in Canadian beef cattle.

J Anim Sci 2017 Dec;95(12):5184-5196

Bivariate animal models were used to estimate phenotypic and genetic correlations between 9 carcass merit and meat tenderness traits with 25 individual and grouped fatty acids in the subcutaneous adipose tissue of a population of 1,366 Canadian beef cattle finishing heifers and steers. In general, phenotypic correlations were low (<0.25 in magnitude) except for moderate phenotypic correlations of 9-17:1 (-0. Read More

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http://dx.doi.org/10.2527/jas2017.1966DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6292258PMC
December 2017
3 Reads

Standardized ileal digestible amino acid contents of canola meal from Canadian crushing plants for growing pigs.

J Anim Sci 2017 Jun;95(6):2670-2679

Studies have shown that there are variations in the chemical and nutritive composition of canola meal (CM) produced in Canada, some of which may result from differences among the canola seed crushing plants. Therefore, it is necessary to determine the variability in the nutritive value of CM as its end users desire increased meal consistency and more information on any potential variability in AA digestibility. Thus, 18 ileal cannulated barrows (average initial BW = 23. Read More

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http://dx.doi.org/10.2527/jas.2017.1372DOI Listing

Management practices associated with stress in cattle on western Canadian cow-calf operations: A mixed methods study.

J Anim Sci 2017 Apr;95(4):1836-1844

Handling, weaning, and euthanasia are some of the most stressful practices performed on cow-calf operations. Although strategies to minimize stress exist, their use on western Canadian cow-calf operations is unknown. The objectives were to describe current stress-associated practices on western Canadian cow-calf operations, describe producer and operation demographics associated with the use of nonabrupt weaning methods, and explore producer perceptions toward these practices. Read More

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http://dx.doi.org/10.2527/jas.2016.1310DOI Listing
April 2017
3 Reads

Management practices associated with pain in cattle on western Canadian cow-calf operations: A mixed methods study.

J Anim Sci 2017 Feb;95(2):958-969

The implementation of on-farm pain mitigation strategies is dependent on feasibility and importance to producers. Currently, there is a lack of information regarding adoption of management practices associated with pain in cattle within the Canadian beef industry. The objective of this mixed methods study was to describe pain-associated practices implemented on farm and producer perceptions toward pain mitigation strategies. Read More

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http://dx.doi.org/10.2527/jas.2016.0949DOI Listing
February 2017

Carcass grading characteristics of serially harvested calf-fed Holstein steers fed zilpaterol hydrochloride.

J Anim Sci 2016 Dec;94(12):5129-5136

Serial harvests were conducted using Holstein steers ( = 110) fed zilpaterol hydrochloride (ZH) for 0 or 20 d prior to harvest. Steers were harvested in 28-d increments beginning at 254 d on feed (DOF) and ending at 534 DOF. After harvest and a 36-h chill period, carcasses were evaluated using grading methods standard for the United States (USDA), Canada (Canadian Beef Grading Association [CBGA]), and Japan (Japanese Meat Grading Agency [JMGA]). Read More

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https://academic.oup.com/jas/article/94/12/5129/4703372
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http://dx.doi.org/10.2527/jas.2016-0837DOI Listing
December 2016
1 Read

Can the monitoring of animal welfare parameters predict pork meat quality variation through the supply chain (from farm to slaughter)?

J Anim Sci 2016 Jan;94(1):359-76

The objective of this study was to assess the relationship between the animal welfare conditions evaluated through the supply chain and pork quality variation. A total of 4,680 pigs from 12 farms-5 animal welfare improved raising system (AWIRS) and 7 conventional raising system (CON) farms-were assessed from farm to slaughter through a comprehensive audit protocol merging the European Welfare Quality, the Canadian Animal Care Assessment, and American Meat Institute audit guide criteria. At the abattoir, a subsample of 1,440 pigs (120 pigs/farm) was randomly chosen out of 24 loads (2 farms per wk) transported by 2 drivers (driver A and driver B) for the assessment of stunning effectiveness, carcass bruises, blood lactate levels, and meat quality traits. Read More

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http://dx.doi.org/10.2527/jas.2015-9176DOI Listing
January 2016
4 Reads

Correlation of fresh muscle firmness with sensory characteristics of pork loins destined for a quality focused market.

J Anim Sci 2015 Oct;93(10):5059-72

Production of pork for quality-driven export markets offers economic incentive. Pork processors use subjective firmness as a sorting tool for loins intended for high-quality export. The objectives of this study were to determine 1) durometer efficacy in muscle, 2) if firmness on one portion of the loin is indicative of other locations, 3) if 1 d firmness is related to export quality traits, and 4) if variation in firmness is explained by mechanistic measures. Read More

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http://dx.doi.org/10.2527/jas.2015-9316DOI Listing
October 2015
2 Reads

Trailer temperature and humidity during winter transport of cattle in Canada and evaluation of indicators used to assess the welfare of cull beef cows before and after transport.

J Anim Sci 2015 Jul;93(7):3639-53

The current study evaluated 17 loads of cull beef cows transported in Canadian winter conditions to assess in-transit temperature and humidity, evaluation of events during loading and unloading, and animal condition and bruising. Regardless of the use of boards to block ventilation holes in trailers, temperatures were higher within trailers than at ambient locations during both travel and stationary periods (P < 0.01). Read More

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http://dx.doi.org/10.2527/jas.2014-8390DOI Listing
July 2015
1 Read

Accounting for uncertainty in the quantification of the environmental impacts of Canadian pig farming systems.

J Anim Sci 2015 Jun;93(6):3130-43

The objective of the study was to develop a life cycle assessment (LCA) for pig farming systems that would account for uncertainty and variability in input data and allow systematic environmental impact comparisons between production systems. The environmental impacts of commercial pig production for 2 regions in Canada (Eastern and Western) were compared using a cradle-to-farm gate LCA. These systems had important contrasting characteristics such as typical feed ingredients used, herd performance, and expected emission factors from manure management. Read More

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http://dx.doi.org/10.2527/jas.2014-8403DOI Listing
June 2015
2 Reads

Effects of various dietary lipid additives on lamb performance, carcass characteristics, adipose tissue fatty acid composition, and wool characteristics.

J Anim Sci 2015 Jun;93(6):3110-20

Tasco (Ascophyllum nodosum; TA) was compared to canola (CO), flax (FO), and safflower oils (SO) for effects on performance, carcass characteristics, and fatty acid profiles of adipose tissue in skirt muscle (SM), subcutaneous and perirenal adipose tissues, and wool production and quality characteristics of Canadian Arcott lambs. Fifty-six lambs were randomly assigned to dietary treatments (n = 14 per treatment). Diets consisted of a pelleted, barley-based finishing diet containing either TA, CO, FO, or SO (2% of dietary DM). Read More

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http://dx.doi.org/10.2527/jas.2014-8437DOI Listing
June 2015
4 Reads

Estimating challenge load due to disease outbreaks and other challenges using reproduction records of sows.

J Anim Sci 2014 Dec 3;92(12):5374-81. Epub 2014 Nov 3.

Animal Breeding and Genomics Centre, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands.

A method was developed and tested to estimate challenge load due to disease outbreaks and other challenges in sows using reproduction records. The method was based on reproduction records from a farm with known disease outbreaks. It was assumed that the reduction in weekly reproductive output within a farm is proportional to the magnitude of the challenge. Read More

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http://dx.doi.org/10.2527/jas.2014-8059DOI Listing
December 2014

Access to pasture for dairy cows: responses from an online engagement.

J Anim Sci 2014 Nov 26;92(11):5185-92. Epub 2014 Sep 26.

Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver V6T 1Z4, Canada

An online engagement exercise documented the views of Canadian and U.S. participants affiliated and unaffiliated with the dairy industry on the issue of pasture access for dairy cows. Read More

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http://dx.doi.org/10.2527/jas.2014-7725DOI Listing
November 2014

Estimation of genomic breeding values for residual feed intake in a multibreed cattle population.

J Anim Sci 2014 Aug;92(8):3270-83

Department of Environment and Primary Industries, AgriBio, 5 Ring Road, Bundoora, VIC 3083, Australia Dairy Futures Cooperative Research Centre (CRC), AgriBio, 5 Ring Road, Bundoora, VIC 3083, Australia Department of Agriculture and Food Systems, Melbourne School of Land and Environment, The University of Melbourne, Parkville, VIC 3010, Australia.

Residual feed intake (RFI) is a measure of the efficiency of animals in feed utilization. The accuracies of GEBV for RFI could be improved by increasing the size of the reference population. Combining RFI records of different breeds is a way to do that. Read More

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https://academic.oup.com/jas/article/92/8/3270/4703676
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http://dx.doi.org/10.2527/jas.2014-7375DOI Listing
August 2014
4 Reads

Effect of diet on microRNA expression in ovine subcutaneous and visceral adipose tissues.

J Anim Sci 2014 Aug 3;92(8):3328-37. Epub 2014 Jun 3.

Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.

Knowledge of the molecular mechanisms that regulate ovine adipogenesis is very limited. MicroRNAs (miRNA) have been reported as one of the regulatory mechanisms of adipogenesis. This study aimed to compare the expression of miRNA related to ovine adipogenesis in different adipose depots and to investigate whether their expression is affected by dietary fatty acid composition. Read More

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http://dx.doi.org/10.2527/jas.2014-7710DOI Listing
August 2014
1 Read

Reliability of molecular breeding values for Warner-Bratzler shear force and carcass traits of beef cattle - an independent validation study.

J Anim Sci 2014 Jul 6;92(7):2896-904. Epub 2014 May 6.

Livestock Gentec, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada Lacombe Research Centre, Alberta Agriculture and Rural Development, 6000 C & E Trail, Lacombe, AB, Canada

Interest in genetic improvement of carcass and tenderness traits of beef cattle using genome-based selection (GS) and marker-assisted management programs is increasing. The success of such a program depends on the presence of linkage disequilibrium between the observed markers and the underlying QTL as well as on the relationship between the discovery, validation, and target populations. For molecular breeding values (MBV) predicted for a target population using SNP markers, reliabilities of these MBV can be obtained from validation analyses conducted in an independent population distinct from the discovery set. Read More

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http://dx.doi.org/10.2527/jas.2013-7374DOI Listing

U. S. consumer perceptions of U. S. and Canadian beef quality grades.

J Anim Sci 2014 Aug 6;92(8):3685-92. Epub 2014 May 6.

Department of Animal and Food Science, Texas Tech University, Lubbock 79409

A U.S. consumer (n = 642) study (Baltimore, MD; Phoenix, AZ; and Lubbock, TX) was conducted to compare consumer sensory scores of U. Read More

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http://dx.doi.org/10.2527/jas.2014-7739DOI Listing

Genetic and phenotypic parameters for carcass and meat quality traits in commercial crossbred pigs.

J Anim Sci 2014 Jul 28;92(7):2869-84. Epub 2014 Apr 28.

Livestock Gentec Centre, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, T6G 2P5, Canada

Pork quality and carcass characteristics are now being integrated into swine breeding objectives because of their economic value. Understanding the genetic basis for these traits is necessary for this to be accomplished. The objective of this study was to estimate phenotypic and genetic parameters for carcass and meat quality traits in 2 Canadian swine populations. Read More

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http://dx.doi.org/10.2527/jas.2014-7685DOI Listing
July 2014
2 Reads

Dose-response of supplementing marine algae (Schizochytrium spp.) on production performance, fatty acid profiles, and wool parameters of growing lambs.

J Anim Sci 2014 May 25;92(5):2202-13. Epub 2014 Mar 25.

Faculty of Veterinary Science, University of Sydney, Sydney, NSW 2006, Australia.

Microalgae are the original source of docosahexaenoic acid (DHA; 22:6n-3) in the marine food chain, and its inclusion in animal feeds has been considered as a means of increasing the DHA level in foods of animal origin. As such, this study aimed to investigate the effects of supplementing an algal meal, high in DHA derived from Schizochytrium spp. (DHA-G), in the diet of Canadian Arcott lambs, on growth, carcass characteristics, wool production, and fatty acid (FA) profiles of subcutaneous adipose tissues (SAT), perirenal adipose tissues (PAT), and skirt muscle (SM). Read More

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http://dx.doi.org/10.2527/jas.2013-7024DOI Listing
May 2014
1 Read

Effects of transport duration on maintenance behavior, heart rate and gastrointestinal tract temperature of market-weight pigs in 2 seasons.

J Anim Sci 2013 Oct 29;91(10):4925-35. Epub 2013 Aug 29.

Laval University, Department of Animal Sciences, Quebec City, QC, Canada G1V 0A6.

Welfare and meat quality of market-weight pigs may be negatively affected by transport duration and environmental temperatures, which vary considerably between seasons. This study evaluated the effects of 3 transport durations (6, 12, and 18 h) on the physiology and behavior of pigs in summer and winter in western Canada. Market-weight pigs were transported using a pot-belly trailer at an average loading density of 0. Read More

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http://dx.doi.org/10.2527/jas.2012-6081DOI Listing
October 2013

Estimates of genetic parameters for stayability to consecutive calvings of Canadian Simmentals by random regression models.

J Anim Sci 2013 Aug 23;91(8):3634-43. Epub 2013 Jul 23.

Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, Guelph, ON N1G 2W1, Canada.

Stayability to consecutive calvings was selected as a measure of cow longevity in the Canadian Simmental population. Calving performance data on 188,579 cows and culling information from the Total Herd Reporting System were used to determine whether a cow stayed in a herd for her second and later (up to the eighth) calvings, given that she had calved as 2 yr old. Binary records (n = 1,164,319) were analyzed with animal linear and threshold models including fixed effects of year of birth by season of birth by parity number and age of cow at first calving by parity number and random effects of contemporary group (CG) defined as herd of birth within year by season, animal additive genetic effect, and a cow permanent environmental (PE) effect. Read More

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http://dx.doi.org/10.2527/jas.2012-6126DOI Listing

Digestibility energy and amino acids of canola meal from two species (Brassica juncea and Brassica napus) fed to distal ileum cannulated grower pigs.

J Anim Sci 2012 Dec;90 Suppl 4:218-20

University of Alberta, Edmonton, AB, Canada.

Yellow-seeded Brassica juncea is a novel canola species targeted to grow in the southern Canadian prairies where thermotolerance, disease resistance, and adaptation to dry agronomic conditions are required. The support of its cultivation needs nutritional evaluation of its coproduct. The B. Read More

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http://dx.doi.org/10.2527/jas.53952DOI Listing
December 2012

Triennial Reproduction Symposium: the obstacle course to successful establishment of pregnancy in domestic livestock species.

Authors:
M D Utt M L Day

J Anim Sci 2013 Jul 23;91(7):2993-9. Epub 2013 Jan 23.

Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA.

The 2012 Triennial Reproduction Symposium (TRS), "Impediments to Fertility in Domestic Animals," was held immediately before the Joint Annual Meeting of the American Society of Animal Science, American Dairy Science Association, Canadian Society of Animal Science, Western Section of the American Society of Animal Science, and the Asociación Mexicana de Producción Animal in Phoenix, AZ, in July, 2012. The theme of the symposium highlighted key impediments or opportunities in the process of creating a pregnancy, beginning with male and female gametes and ending with a viable fetus. The 2012 TRS was designed to focus on areas of current and exciting investigation across a variety of species and to include 8 presentations from a mix of established and early-career scientists. Read More

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http://dx.doi.org/10.2527/jas.2012-5947DOI Listing

Accuracies of direct genomic breeding values in Hereford beef cattle using national or international training populations.

J Anim Sci 2013 Apr 23;91(4):1538-51. Epub 2013 Jan 23.

Department of Animal Science, Iowa State University, Ames 50011, USA.

The objective of this study was to estimate accuracies of direct genomic breeding values (DGV) for nationally evaluated traits of 1,081 American (AMH), 100 Argentine (ARH), 75 Canadian (CAH), and 395 Uruguayan (URH) Hereford animals genotyped using the Illumina BovineSNP50 BeadChip. Deregressed EBV (DEBV) were used as observations in a weighted analysis to derive DGV using BayesB and BayesC methods. The AMH animals were clustered into 4 groups, using either K-means or random clustering. Read More

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http://dx.doi.org/10.2527/jas.2012-5593DOI Listing
April 2013
2 Reads

Meta-analysis of the effects of ractopamine hydrochloride on carcass cutability and primal yields of finishing pigs.

J Anim Sci 2013 Feb 12;91(2):1015-23. Epub 2012 Nov 12.

Department of Animal Sciences, The Ohio State University, Columbus 43210, USA.

The objective was to summarize previous literature, using a meta-analysis approach, on the effects of ractopamine hydrochloride (RAC) when fed at doses of 5 to 10 mg/kg for up to 35 d before harvest on carcass cutability and belly quality of finishing pigs. The meta-analysis provided an opportunity to determine the consensus of previously published literature. Ten studies were evaluated to determine cutting yields and 8 studies were used to determine belly quality in this review. Read More

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http://dx.doi.org/10.2527/jas.2012-5647DOI Listing
February 2013

Quantification of saleable meat yield using objective measurements captured by video image analysis technology.

J Anim Sci 2012 Sep;90(9):3294-300

Beef Carcass Research Center-Department of Agricultural Sciences, West Texas A&M University, Canyon 79016, USA.

Video image analysis (VIA) images from grain-finished beef carcasses [n = 211; of which 63 did not receive zilpaterol hydrochloride (ZIL) and 148 received ZIL before harvest] were analyzed for indicators of muscle and fat to illustrate the ability to improve methodology to predict saleable meat yield of cattle fed and not fed ZIL. Carcasses were processed in large commercial beef processing facilities and were fabricated into standard subprimals, fat, and bone. Images taken by VIA technology were evaluated using computer image analysis software to quantify fat and lean parameters which were subsequently used in multiple-linear regression models to predict percentage of saleable meat yield for each carcass. Read More

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http://dx.doi.org/10.2527/jas.2011-4223DOI Listing
September 2012

Space allowance during commercial long distance transport of cattle in North America.

J Anim Sci 2012 Oct 13;90(10):3618-29. Epub 2012 Jun 13.

Agriculture and Agri-Food Canada, Lethbridge Research Centre, Lethbridge, T1J 4B1, AB, Canada.

The objective of the present work was to study space allowance in cattle during commercial long haul transport (≥400 km; n = 6,152 journeys). Surveys, delivered to livestock transport carriers, gathered information on the number, BW, and distribution of cattle by trailer compartment as well as the characteristics of the transport vehicles used. Space allowance (SA; m(2)/animal), allometric coefficient (k = SA / BW(0. Read More

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http://dx.doi.org/10.2527/jas.2011-4771DOI Listing
October 2012

Barley-derived β-glucans increases gut permeability, ex vivo epithelial cell binding to E. coli, and naive T-cell proportions in weanling pigs.

J Anim Sci 2012 Aug 5;90(8):2652-62. Epub 2012 Mar 5.

Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton T6G 2P5, Canada.

Weaning in young animals is associated with an increased incidence of gastrointestinal infections. β-glucans exert numerous physiological effects, including altering immune function. The objective of this study was to determine the effects of feeding barley (Hordeum vulgare L. Read More

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http://dx.doi.org/10.2527/jas.2011-4381DOI Listing
August 2012
6 Reads

Standardized ileal digestible tryptophan-to-lysine ratios in growing pigs fed corn-based and non-corn-based diets.

J Anim Sci 2012 Apr 11;90(4):1270-9. Epub 2011 Nov 11.

Department of Animal and Food Sciences, University of Kentucky, Lexington 40546, USA.

Two 21-d experiments were conducted to determine the optimum standardized ileal digestible (SID) Trp:Lys in growing pigs fed corn-based diets compared with non-corn-based diets. The primary response variables in both experiments were ADG and plasma urea N (PUN) concentrations with the optimum SID Trp:Lys determined using broken-line analysis. Experiment 1 evaluated the optimum SID Trp:Lys in growing pigs fed corn-based diets consisting primarily of corn with minor inclusion of Canadian field peas and corn gluten meal to keep the SID Trp:Lys low. Read More

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http://dx.doi.org/10.2527/jas.2011-4537DOI Listing

Effects of exogenous enzymes in corn-based and Canadian pearl millet-based diets with reduced soybean meal on growth performance, intestinal nutrient digestibility, villus development, and selected microbial populations in broiler chickens.

J Anim Sci 2011 Dec 5;89(12):4100-8. Epub 2011 Aug 5.

Animal Science Department, McGill University, Ste. Anne de Bellevue, Québec, Canada.

An experiment was conducted to compare a commercial corn-soybean meal diet with a pearl millet diet containing less soybean meal (-27%), alone or in combination with exogenous enzymes, on growth performance, jejunal villus development, ileal CP, and AA digestibility, and cecal microbial populations in broilers. One hundred sixty 1-d-old male Ross 508 broilers (5/cage) were randomly allocated to one of the following dietary treatments: 1) a standard corn-soybean meal control diet (CTL); 2) a pearl millet-soybean meal diet (PM); 3) CTL + exogenous enzymes (CE); and 4) PM + exogenous enzymes (PE) with 8 replicate cages/treatment. The PM and PE diets contained less soybean meal because of greater CP and AA contents of pearl millet. Read More

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http://dx.doi.org/10.2527/jas.2011-4045DOI Listing
December 2011
2 Reads

Ruminant Nutrition Symposium: Acidosis: new insights into the persistent problem.

J Anim Sci 2011 Apr 10;89(4):1090-1. Epub 2010 Dec 10.

Department of Agricultural, Food and Nutritional Science, University of Alberta Edmonton, Alberta, Canada.

The Ruminant Nutrition Symposium titled "Acidosis: New insights into the persistent problem" was held at the Joint Annual Meeting of the American Dairy Science Association, American Society of Animal Science, Poultry Science Association, Asociación Mexicana de Producción Animal, Western Section-ASAS, and the Canadian Society of Animal Science in Denver, Colorado, July 11 to 15, 2010. The objective of the symposium was to provide the ruminant nutrition community with new insights and perspectives from recent research findings on acidosis. Under modern production systems, ruminants are fed high-grain diets to maximize their energy intake and productivity. Read More

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http://dx.doi.org/10.2527/jas.2010-3727DOI Listing

Genetic parameters for calving ease, gestation length, and birth weight in Charolais cattle.

J Anim Sci 2009 Sep 22;87(9):2759-66. Epub 2009 May 22.

Department of Agriculture, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5 Canada.

In this study, a 3-trait linear model was used to obtain genetic parameters for direct and maternal components of calving ease (CE), gestation length (GEST), and birth weight (BWT). Calving ease scores were transformed into Snell scores and expressed as percent unassisted calving (SC), ranging from 0 to 100% (least to greatest ease). A total of 40,420 records (n = 14,403 for CE) were obtained from the Canadian Charolais Association field database. Read More

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http://dx.doi.org/10.2527/jas.2008-1141DOI Listing
September 2009

Age of dam and sex of calf adjustments and genetic parameters for gestation length in Charolais cattle.

Authors:
D H Crews

J Anim Sci 2006 Jan;84(1):25-31

Agriculture and Agri-Food Canada Research Centre, Lethbridge, Alberta T1J 4B1, Canada.

To estimate adjustment factors and genetic parameters for gestation length (GES), AI and calving date records (n = 40,356) were extracted from the Canadian Charolais Association field database. The average time from AI to calving date was 285.2 d (SD = 4. Read More

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January 2006

Consumer sensory acceptance and value of domestic, Canadian, and Australian grass-fed beef steaks.

J Anim Sci 2005 Dec;83(12):2863-8

Animal Science Department, University of Nebraska, Lincoln, 68583-0908, USA.

To determine US consumer acceptance and value of beef from various countries, 24 taste panels of consumers (n = 273 consumers) were conducted in Denver and Chicago. Two pairs of strip steaks were evaluated for flavor, juiciness, tenderness, and overall acceptability on eight-point hedonic scales. One pair consisted of an Australian grass-fed strip steak and a domestic strip steak, whereas the other pair included Canadian and domestic strip steaks. Read More

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http://dx.doi.org/10.2527/2005.83122863xDOI Listing
December 2005
2 Reads

The tryptophan requirement of growing and finishing barrows.

J Anim Sci 2005 Jun;83(6):1303-11

Department of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, 70803-4210, USA.

Five experiments were conducted to determine the true ileal digestible Trp (tidTrp) requirement of growing and finishing pigs fed diets (as-fed basis) containing 0.87% (Exp. 3), 0. Read More

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http://dx.doi.org/10.2527/2005.8361303xDOI Listing

The tryptophan requirement of nursery pigs.

J Anim Sci 2002 Oct;80(10):2646-55

Department of Animal Science, Louisiana State University Agricultural Center, Baton Rouge 70803, USA.

Five experiments were conducted to determine the true digestible Trp (dTrp) requirement of nursery pigs. Treatments were replicated with four or five pens of five or six pigs each. Pigs were weaned at 21 (Exp. Read More

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October 2002
2 Reads

Estimation of additive and nonadditive genetic variances in Hereford, Gelbvieh, and Charolais by Method R.

J Anim Sci 2001 Dec;79(12):2997-3001

Animal and Dairy Science Department, University of Georgia, Athens 30602-2771, USA.

Parameters for direct and maternal dominance were estimated in models that included non-additive genetic effects. The analyses used weaning weight records adjusted for age of dam from populations of Canadian Hereford (n = 467,814), American Gelbvieh (n = 501,552), and American Charolais (n = 314,552). Method R estimates of direct additive genetic, maternal additive genetic, permanent maternal environment, direct dominance, and maternal dominance variances as a proportion of the total variance were 23, 12, 13, 19, and 14% in Hereford; 27, 7, 10, 18, and 2% in Gelbvieh; and 34, 15, 15, 23, and 2% in Charolais. Read More

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December 2001

Evaluation of the 1996 NRC beef model under western Canadian environmental conditions.

J Anim Sci 2001 Jan;79(1):267-75

Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada.

Two feedlot trials were conducted to evaluate the 1996 NRC beef model under western Canadian conditions. In the first trial, 144 Charolais- (304.6 +/- 16. Read More

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January 2001

Accounting for lactation length and weaning-to-conception interval in genetic evaluations for litter size in swine.

J Anim Sci 2000 Jul;78(7):1796-810

Department of Animal Science and Centre de Recherche en Biologie de la Reproduction (CRBR), Laval University, Quebec City, Quebec, Canada.

Effects of lactation length and weaning-to-conception interval on the subsequent litter size of purebred sows were estimated using an animal model. Data on 2,847 Landrace sows with 7,125 litters born between January 1989 and May 1997 and on 1,234 Yorkshire sows with 2,999 litters born between January 1990 and May 1997 were obtained from two Canadian selection herds. Sows having a lactation of less than 14 d (MMEW) were usually not mated until their second estrus, whereas sows weaned after at least 14 d of lactation (later weaning) were usually mated on their first estrus. Read More

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Relationship of fatty acid composition to intramuscular fat content in beef from crossbred Wagyu cattle.

J Anim Sci 1999 Jul;77(7):1717-25

Department of Chemistry and Biochemistry, University of Lethbridge, Alberta, Canada.

The deposition of i.m. fat, or marbling, in cattle is recognized as a desirable carcass trait in North American beef grading schemes. Read More

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July 1999
53 Reads

Estimation of genetic parameters for litter size in Canadian Yorkshire and Landrace swine with each parity of farrowing treated as a different trait.

Authors:
R Roehe B W Kennedy

J Anim Sci 1995 Oct;73(10):2959-70

Department of Animal and Poultry Science, University of Guelph, Ontario, Canada.

Genetic variances and covariances for the number of pigs born in total (NOBT), the number of pigs born alive (NOBA), and the number of weaned pigs (NOW) were estimated by REML under an animal model. Data on 30,357 and 42,041 litters born between 1977 and 1992 from Yorkshire and Landrace sows, respectively, were obtained from the Quebec Record of Performance sow productivity program. Data of the first four parities of litter size were used for four different analyses under an animal model: univariate analyses with direct genetic effects only, univariate analyses with maternal and direct genetic effects , seri0s of bivariate analyses with each parity treated as a different trait, and a series of bivariate analyses between NOBT, NOBA, and NOW within each parity. Read More

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October 1995
2 Reads

Growth and carcass characteristics of beef steers fed silage and different levels of energy with or without protein supplementation.

J Anim Sci 1994 Dec;72(12):3221-9

Experimental Farm, Agriculture and Agri-Food Canada, La Pocatière, QC.

Fifty-six large-framed crossbred steers averaging 227 kg were used in an experiment including a growing period (24 wk) and a finishing period ending when the steers had approximately 4 to 10 mm of fat thickness (Canadian grade A1). Steers were individually fed and assigned to a completely randomized design with seven treatments for the growing period. From the end of the growing period until slaughter, all steers received the same basal diet. Read More

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December 1994