Genetics and Breeding (Online Only): Animal Model Genetic Evaluation of Type Traits For Five Dairy Cattle Breeds

摘要

A system to calculate genetic evaluations based on an animal model was developed for final score (single-trait model) and 15 linear type traits (mul- titrait model) of Ayrshires, Brown Swiss, Guernseys, Jerseys, and Milking Shorthorns. (Co) variance com- Ponents were estimated from appraisal that were Scored during 1988 and later and that included all Linear traits. The model for (co) variance components Included fixed effects for interactions of herd, ap- Praisal date, and parity; parity and appraisal age; And parity and lactation stage.