Bias was estimated in test day and lactation model evaluations for first lactation milk yield from a data set of 675,283 cows. Empirical bias was defined as an average difference between estimated breeding values and pedigree indices. Statistically significant, but, in practice, negligible bias was found for daughters of both proven and young sires, and for daughters of bull dam candidates. The amount of bias in test day evaluations was unaffected by the comparison group definition used. Keywords: Ayrshire, breeding value estimation, milk production

J. Poso, Esa A Mäntysaari, M. Lidauer, I. Stranden, A. Kettunen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 339–342, 1998
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