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The incidence of elevated progesterone post partum in Suffolk ewes lambed in early January

Published online by Cambridge University Press:  05 November 2021

W S Dingwall ,
W A C McKelvey ,
F E Gebbie  and
J J Robinson
W S Dingwall
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
W A C McKelvey
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
F E Gebbie
Affiliation:
Scottish Agricultural College, Craibstone Estate, Aberdeen AB21 9JA
J J Robinson
Affiliation:
Scottish Agricultural College, Craibstone Estate, Aberdeen AB21 9JA
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Extract

Effective oestrous synchronisation for sheep AI programmes is characterised by low progesterone concentrations at the time of insemination. In a large scale study of over 2,000 Suffolk ewes inseminated in early August Dingwall et al (1996), found that a significant proportion (0.055) had elevated progesterone concentrations at the time of insemination. McKelvey et al (1997) showed that aberrant luteal activity occurs in some Suffolk ewes in deep anoestrus and speculated that this phenomenon was due to spontaneous ovulations following the preceding lambing. The present study involved the monitoring of circulating progesterone concentrations in Suffolk ewes lambing in early January with the aim of establishing the incidence and nature of ovarian luteal activity post lambing.

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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 183
Copyright
Copyright © The British Society of Animal Science 1998

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References

Dingwall, W.S., McKelvey, W.A.C., Gebbie, F.E. and Robinson, J.J. [1996]. The incidence of elevated progesterone at the time of insemination in Suffolk ewes bred in August. Animal Science 62: 673.Google Scholar
McKelvey, W.A.C., Robinson, J.J., Gebbie, F., Lindsay, E. and Dingwall, W.S. [1997]. The identification and treatment of aberrant luteal activity during anoestrus in Suffolk ewes submitted for artificial insemination. In: Proceedings of the British Society of Animal Science 1997, p182.Google Scholar