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Full-Text Articles in Life Sciences
Comparison Of Models To Estimate Genetic Effects For Weaning Weight Of Angus Cattle, J. Dodenhoff, L. Dale Van Vleck, D. E. Wilson
Comparison Of Models To Estimate Genetic Effects For Weaning Weight Of Angus Cattle, J. Dodenhoff, L. Dale Van Vleck, D. E. Wilson
Department of Animal Science: Faculty Publications
Weaning weights from nine sets of Angus field data from three regions of the United States were analyzed. Six animal models were used to compare two approaches to account for an environmental dam-offspring covariance and to investigate the effects of sire × herd-year interaction on the genetic parameters. Model 1 included random direct and maternal genetic, maternal permanent environmental, and residual effects. Age at weaning was a covariate. Other fixed effects were age of dam and a herd-year-management-sex combination. Possible influence of a dam’s phenotype on her daughter’s maternal ability was modeled by including a regression on maternal phenotype (f …
Estimation Of Direct, Maternal, And Grandmaternal Genetic Effects For Weaning Weight In Several Breeds Of Beef Cattle, J. Dodenhoff, L. Dale Van Vleck, K. E. Gregory
Estimation Of Direct, Maternal, And Grandmaternal Genetic Effects For Weaning Weight In Several Breeds Of Beef Cattle, J. Dodenhoff, L. Dale Van Vleck, K. E. Gregory
Department of Animal Science: Faculty Publications
Weaning weights from nine parental breeds and three composites were analyzed to estimate variance due to grandmaternal genetic effects and to compare estimates for variance due to maternal genetic effects from two different models. Number of observations ranged from 794 to 3,465 per population. Number of animals in the pedigree file ranged from 1,244 to 4,326 per population. Two single-trait animal models were used to obtain estimates of covariance components by REML using an average information method. Model 1 included random direct and maternal genetic, permanent maternal environmental, and residual environmental effects as well as fixed sex ´ year and …
Effects Of Backgrounding And Growing Programs On Beef Carcass Quality And Yield, Terry J. Klopfenstein, R. Cooper, D. J. Jordon, D. Shain, T. Milton, Chris R. Calkins, C. Rossi
Effects Of Backgrounding And Growing Programs On Beef Carcass Quality And Yield, Terry J. Klopfenstein, R. Cooper, D. J. Jordon, D. Shain, T. Milton, Chris R. Calkins, C. Rossi
Department of Animal Science: Faculty Publications
Clearly, the future of the beef cattle industry in the United States depends on the quality of the product. The majority of calves are born in the spring; therefore, to have a consistent supply of feeders entering feedlots and to take advantage of forages, a variety of stocker programs exist. Cattle enter the feedlot at varying weights and ages and from different nutritional backgrounds, and this variation could produce differences in carcass quality. The economically important measures of carcass quality are yield grade and quality grade. They are directly related: as cattle fatten in the feedlot, both quality grade and …