The importance of infertility izt:d~iry cattle has been emphasized by the increased attention being: paid to ac~t'te breeding records in connection with the rapid growth of artificial inseminafton. Tlmf this problem is of grit importance to dairymen is Shown bythe findings of Barrett et a~. (3) that 45.8 per cent of the cows were not pregnant:after oneservice.
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Christian et al. (1951) studied this question.
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