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Sex Effects On Breed Of Sire Differences For Birth, Weaning, And Yearling Weights, L. Dale Van Vleck, Larry V. Cundiff
Sex Effects On Breed Of Sire Differences For Birth, Weaning, And Yearling Weights, L. Dale Van Vleck, Larry V. Cundiff
Department of Animal Science: Faculty Publications
Weights of males and females can be considered to be correlated traits with different averages and variances. This study attempted to determine whether defining traits as expressed in males or in females would change estimates of breed of sire differences needed to calculate across-breed factors for adjustment of within-breed EPD to across-breed EPD. Records from the US Meat Animal Research Center of progeny of Hereford, Angus, and MARC III composite dams mated to 12 sire breeds that had been used to calculate breed of sire adjustments in 1996 were used. Breeds of sire were Hereford, Angus, Shorthorn, Brahman, Simmental, Limousin, …
Comparison Of Sire Breed Solutions For Growth Traits Adjusted By Mean Expected Progeny Differences To A 1993 Base, K. L. Barkhouse, L. Dale Van Vleck, Larry V. Cundiff, D. S. Buchmann, D. M. Marshall
Comparison Of Sire Breed Solutions For Growth Traits Adjusted By Mean Expected Progeny Differences To A 1993 Base, K. L. Barkhouse, L. Dale Van Vleck, Larry V. Cundiff, D. S. Buchmann, D. M. Marshall
Department of Animal Science: Faculty Publications
Records on growth traits were obtained from five Midwestern agricultural experiment stations as part of a beef cattle crossbreeding project (NC-196). Records on birth weight (BWT, n =3,490), weaning weight (WWT, n = 3,237), and yearling weight (YWT, n = 1,372) were analyzed within locations and pooled across locations to obtain estimates of breed of sire differences. Solutions for breed of sire differences were adjusted to the common base year of 1993. Then, factors to use with within-breed expected progeny differences (EPD) to obtain a crossbreed EPD were calculated. These factors were compared with factors obtained from similar analyses of …
Effect Of Ignoring Random Sire And Dam Effects On Estimates And Standard Errors Of Breed Comparisons, K. L. Barkhouse, L. Dale Van Vleck, Larry V. Cundiff
Effect Of Ignoring Random Sire And Dam Effects On Estimates And Standard Errors Of Breed Comparisons, K. L. Barkhouse, L. Dale Van Vleck, Larry V. Cundiff
Department of Animal Science: Faculty Publications
Data were weights of F1 calves and weaning weights of top-cross progeny from sires and maternal grandsires of 13 breeds. Three analyses were performed on each trait to obtain estimates and standard errors of breed effects needed to calculate across-breed EPD and accuracies. Model (R) for records of F1 progeny contained fixed effects for birth year and date of birth, sex, age and breed of dam, and breed of sire, and a random residual effect. The second analysis included random effects for sires (RS), and the third analysis included random effects for sires and dams (RSD). In maternal …