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Genetic And Phenotypic Parameters For Carcass Traits Of American Shorthorn Beef Cattle, F. Pariacote, R. E. Hunsley, L. Dale Van Vleck
Genetic And Phenotypic Parameters For Carcass Traits Of American Shorthorn Beef Cattle, F. Pariacote, R. E. Hunsley, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Carcass measurements were taken on 1,292 steers and collected by the American Shorthorn Association. The sires were purebred or appendix-registered Shorthorn. Because all dams were not Shorthorn, genetic fractions of breeds of origin were determined for each dam. Measurements for hot carcass weight; dressing percentage; fat thickness; ribeye area; kidney, pelvic, and heart fat (KPH); marbling; and yield grade were analyzed jointly with a multivariate REML algorithm to estimate heritabilities of and genetic and phenotypic correlations among the traits. The sire model chosen as best fit of the data included fixed effects of herd of origin (377 classes), slaughter group …
Parameter Estimates For Direct, Maternal, And Grandmaternal Genetic Effects For Birth Weight And Weaning Weight In Hereford Cattle, J. Dodenhoff, L. Dale Van Vleck, Stephen D. Kachman, R. M. Koch
Parameter Estimates For Direct, Maternal, And Grandmaternal Genetic Effects For Birth Weight And Weaning Weight In Hereford Cattle, J. Dodenhoff, L. Dale Van Vleck, Stephen D. Kachman, R. M. Koch
Department of Animal Science: Faculty Publications
Birth and weaning weights adjusted for age of dam from four lines of Hereford cattle were analyzed to determine the relationships among grandmaternal, maternal, and direct genetic effects. Three lines were selected for 1) weaning weight (WWL), 2) yearling weight (YWL), and 3) an index of yearling weight and muscle score (IXL). The fourth line was an unselected control line (CTL). Numbers of observations ranged from 1,699 (CTL) to 2,811 (WWL), and number of animals in the pedigree file ranged from 2,266 to 3,192. Two animal models were used to obtain estimates by REML using an average information method. Model …