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The repeatability of a good or poor individual breeding record in dairy cattle from year to year and the hereditability of high or low breeding efficiency for individuals and families is a question that receives considerable discussion among dairymen. Since artificial insemination has come into wide use, the variations in fertility for dairy bulls have been recognized and studied more than the fluctuations in the breeding efficiency of dairy females.
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Trimberger et al. (1945) studied this question.
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