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Full-Text Articles in Life Sciences
Estimates Of Genetic Parameters For 320-Day Pelvic Measurements Of Males And Females And Calving Ease Of 2-Year-Old Females, L. A. Kriese, L. Dale Van Vleck, K. E. Gregory, K. G. Boldman, Larry V. Cundiff, R. M. Koch
Estimates Of Genetic Parameters For 320-Day Pelvic Measurements Of Males And Females And Calving Ease Of 2-Year-Old Females, L. A. Kriese, L. Dale Van Vleck, K. E. Gregory, K. G. Boldman, Larry V. Cundiff, R. M. Koch
Department of Animal Science: Faculty Publications
Records from 12 breed groups collected from 1983 to 1991, included in the Germ Plasm Utilization project at the U.S. Meat Animal Research Center, were analyzed separately by breed group and combined to estimate heritabilities and genetic correlations for 320-d male and female pelvic width, height, and area, and for 320-d male pelvic and female 2-yr-old calving ease. Calving ease was analyzed as a trait of the dam using 1) actual and 2) binary scale calving ease scores with a covariate of calf birth weight. A bivariate animal model and derivative-free REML incorporating sparse matrix techniques were used. When breed …
Heritability And Repeatability For Milk Production Traits Of Japanese Holsteins From An Animal Model, Mitsuyoshi Suzuki, L. Dale Van Vleck
Heritability And Repeatability For Milk Production Traits Of Japanese Holsteins From An Animal Model, Mitsuyoshi Suzuki, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Records of the first three lactations of cows were obtained from the file of the Dairy Herd Testing Association in Hokkaido. The data were divided into 10 files containing approximately 24,000 cows each. The derivative-free REML method was used to estimate variances with a repeatability model. The model contained herd-year, calving month, and the linear and quadratic effects of age at calving as fixed effects; additive genetic, permanent environmental, and temporary environmental effects were the random effects. Estimates from the 10 data files were pooled into a simple arithmetic mean. Empirical standard errors were. calculated from the samples. Average estimates …