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First-lactation milk records of artificially sired Holstein cows in New York were analyzed by a sire-by-herd varianee component analysis separately for each year from 1954 to 1962. The two variables analyzed were 305-day, 2 , mature equivalent records and the mature equivalent records expressed as deviations from the average of their herd-mates. The total
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L.D. Van Vleck (1966) studied this question.
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