Results of multivariate individual animal model genetic evaluations of British pedigree beef cattle

摘要: This paper reports the procedures put into place in UK for genetic evaluation of pedigree beef cattle and estimation trends using a comprehensive model to allow critical analysis progress made under previous data recording schemes. Live weights Simmental, Limousin, Charolais, South Devon Aberdeen Angus cattle, recorded by Meat Livestock Commission (MLC) from 1970 1992 were analysed, as part project introduce best linear unbiased predictions (BLUP) breeding value British industry. Birth available MLC or relevant breed society, (4000 84000 records, depending on breed) 200- 400-day estimated within-animal regression all (resulting 8000 48000 records per breed). Animals retrospectively assigned contemporary groups within herds, separately each trait, taking account observed calving patterns. Records adjusted correct heterogeneity variance between herds. BLUP evaluations then performed breed, fitting multivariate individual animal model. In addition additive direct effects, maternal dam permanent environmental effects included birth weight 200-day weight. Unknown parents groups, based date birth. The fixed group, sex, month birth, type (single multiple), embryo transfer births, fostered calves, dam, proportion purebred age dam. Genetic regressing values animals their year Trends weight, approximately 0·09, 0·73 1·38 kg annum respectively Charolais breed; 0·08, 0·76 1·33 Simmental; 0·06, 0·53 0·89 Limousin; 0·12, 1·02 1·86 Angus; 0·03, 0·38 0·82 breed.