This paper presents a concrete application of an Animal Model genetic evaluation. Such a model is becoming the international reference for evaluation purposes. After a description of the technical assumptions, emphasis is on problems encountered during the implementation. The correlation with previous estimates is high, above 0.975 for AI bulls, above 0.90 for other males. The genetic trend estimated with the animal model remains unchanged in closed populations (Normande and Montbiliarde). However, in the Friesian breed, which is being absorbed into the North American Holstein strain, it appears 23 % lower and different points seem to show that it is underestimated. Finally, advantages and limits of the animal model are presented. The main advantage is its theoretical clarity and, consequently, its ease to be explained. The main limit may be the excessive confidence of breeders who sometimes tend to forget that results will always remain highly dependent on the quality of the data.

B. Bonaiti, Didier Boichard

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 364–373, 1990
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