Egg Transfer in Cattle

G.A. Struthers and D.P.J. Marshall

P.O. Box 4, Winton

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Proceedings of the New Zealand Society of Animal Production. 1976, 36: 58-66

The techniques of superovulation of donor cows, egg recovery and transfer used in a large-scale egg transfer programme are described together with details of management of a large herd of recipient cows. Slightly more than 75% of eggs were recovered and of these -approximately 80% were fertilized. During the latter part of the first season a mean of 1.9 pregnancies per donor operation was achieved in comparison with 3.7 pregnancies per donor operation in the second season. Cows treated with PMSG for a second or third time had a lower ovarian response than cows treated for the first time. There was a small decline in ovarian response and in the mean number of pregnancies per donor operation in the autumn-winter period in comparison with results from the spring- summer period.

Keywords: NZSAPAB;

Last Updated 24-08-2000