Applications of animal models to dairy populations of over a million cows are reviewed. National evaluations of this scale are in place in Canada, France, Italy and United States; the largest of these in the United States involves over ten million animals. Variations to the basic single trait, repeatability model are discussed. Computing strategies adopted for solving these enormous sets of sparse equations are summarized. Advantages from changing to animal model evaluations include possible overall time savings in computing, an increase in accuracy (10 to 20%), and a simple decomposition of indexes that promotes better comprehension and acceptance.

G. B Jansen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 58–61, 1990
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