Fluctuations in Sire Evaluations

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Abstract
Large fluctuations in an artificial insemination sire''s evaluations concern dairymen and artificial insemination studs. Characteristics of 3 bulls with high initial values which dropped on later evaluations were compared with those of 17 normal bulls. Characteristics included genetic yield, management, genetic trend, environmental trend and size of herds where daughters freshened, genetic merit of mates and average age at freshening of daughters in 1st lactation. Fluctuations are apparently from preferential treatment of daughters of some sires as well as randomness inherent in methods of sampling and evaluating sires.

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