Oestrogen and the PRID
J.F. Smith, L.T. McGowan
Ruakura Animal Research Station, Hamilton
Proceedings of the New Zealand Society of Animal Production.
1982, 42: 87-90
Two experiments involving 715 suckling beef cows were conducted
to determine the effects of oestrogen treatment at the time of PRID
insertion on the synchronisation of oestrus and conception rate to timed
AI. Experiment 1 examined the route of administration and dose level of
oestrogen while Experiment 2 studied the effect of oestrogen treatment
at PRID insertion and/or an injection of prostaglandin at the time of
PRID removal. Treatment with oestrogen resulted in an 18% improvement
in synchrony and a 9% increase in conception rate. A dose level of
oestrogen 4 times that given by intramuscular injection was required to
achieve similar results when it was administered via a gelatine capsule
attached to the PRID.
Keywords: NZSAPAB;
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Last Updated 03-05-1997
