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Active immunisation against androstenedione in a synchronised early lambing flock

Published online by Cambridge University Press:  21 November 2017

Beverley J. Keeling ,
Margaret E. King  and
G.J. Gunn
Beverley J. Keeling
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen
Margaret E. King
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen
G.J. Gunn
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen
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Extract

Active immunisation against androstenedione (Fecundin, Coopers Animal Health) increases ovulation and lambing rates. A study undertaken during the 1984-85 breeding season in randomly cycling ewes mated during October and November showed an increase in lambing rate of 24 lambs/100 ewes mated amongst ewes treated with Fecundin (Vipond, Keeling and Hunter, 1986). Fecundin increased the Incidence of triplet and quad births, suggesting that the greater benefit from the product would be derived in a situation where management could ensure the survival of additional lambs. The early lambing flock is such a case. Ovulation rates tend to be lower than later on in the breeding season, so fewer triplets might be expected amongst treated ewes. Management tends to be of a high standard, and the value of the early finished lamb is high.

Type
Sheep Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1986 , March 1986 , pp. 33
Copyright
Copyright © The British Society of Animal Production 1986

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