The reproductive performance of New Zealand dairy cows after induction of calving

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Abstract
Induction of premature calving contributes to subsequent failure of some dairy cows to become pregnant and calve. Of a sample of 276 cows, 16.7% failed to calve the following year despite the occurrence of estrus relatively early after calving and several matings. The cows which did conceive had a normal 1st-mating calving rate of 53.9%, requiring 1.7 matings/pregnancy. Two of the 18 survey herds under consideration suffered lengthy calving-to-first-mating estrus intervals, presumably because the induced cows were in poor condition at the time of calving.

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