The anoestrous syndrome in New Zealand dairy cattle

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Abstract
Extract In order to maintain the concentrated seasonal calving pattern which is a feature of dairying in New Zealand, herd owners must successfully mate or inseminate a high percentage of their cows within a limited mating period. That this does not always occur is indicated by the report of Fielden et al. (1973) Fielden, E. D. , Macmillan, K. L. and Watson, J. D. 1973. The anoestrous syndrome in New Zealand dairy cattle. 1. A preliminary investigation. N.Z. vet. J., 21: 77–81. [Taylor & Francis Online] [Google Scholar] who found that, among 14 Manawatu and Wairarapa dairy herds, 21% of the 2-year-old cows were not inseminated during the first 4 weeks of mating even though most of thesecows had calved at least 60 days priorto examination. Over 90% of these unmated 2-year-old cows exhibited an anoestrous syndrome associated with small inactive ovaries.

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