Abstract
Extract Inability to get cows to calve at the required time is a serious problem in the dairy and beef industries. It is particularly important to dairy factory supply herds in New Zealand, where COWS must calve during late winter to make the best use of the spring and early summer growth of pasture. The New Zealand Dairy Board has given, the overall incidence of dairy herd infertility and has described the main type which occurs. The Board's data are summarized here :

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