The anoestrous syndrome in New Zealand dairy cattle. 2. Some factors influencing submission rates in Taranaki herds

Authors: Macmillan KL, Watson JD, Fielden ED
Publication: New Zealand Veterinary Journal, Volume 23, Issue 1-2, pp 4-8, Jan 1975
Publisher: Taylor and Francis

Animal type: Cattle, Livestock, Production animal, Ruminant
Subject Terms: Oestrus/oestrous, Reproduction - female, Reproduction
Article class: Scientific Article

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Abstract: 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) 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 these cows had calved at least 60 days prior to examination. Over 90% of these unmated 2-year-old cows exhibited an anoestrous syndrome associated with small inactive ovaries. Submission rate has been defined as the percentage of cows mated or inseiminated during the first 4 weeks of a herd`s mating programme (Macmillan and Watson, 1973). This paper presents results from an extensive survey undertaken in co-operation with the Taranaki Livestock Improvement Association in 1972. It examines the effects of age, breed, herd size, the herd`s average level of production, and methods of oestrous detection on submission rate.

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