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The incidence of elevated progestrone at the time of insemination in Suffolk ewes bred in August

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, United Kingdom
W A C McKelvey
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, United Kingdom
F E Gebbie
Affiliation:
Scottish Agricultural College, 581 King Street, Aberdeen AB9 1UD, United Kingdom
J J Robinson
Affiliation:
Scottish Agricultural College, 581 King Street, Aberdeen AB9 1UD, United Kingdom
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Extract

The development of laparoscopic intrauterine insemination for sheep has been essential for the implementation of national Sire Reference Schemes in the UK (McKelvey and Simm, 1995). Whilst conception rate to artificial insemination (AI) has averaged 60-70% in most participating flocks, a number of flocks have experienced a proportion of their ewes returning to anoestrus following AI. This phenomenon restricts the implementation of sire reference schemes and it has been proposed that die causal factor could be the presence of a persistent corpus luteum at the time of insemination.

Type
Sheep
Information
Proceedings of the British Society of Animal Science , Volume 1996 , March 1996 , pp. 188
Copyright
Copyright © The British Society of Animal Science 1996

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References

McKelvey, W.A.C. and Simm, G. 1995. Intrauterine insemination, transcervical insemination and embryo transfer for practical breed improvement in small ruminants. Programme and Abstracts of the 46th Annual Meeting of the European Association for Animal Production p229.Google Scholar
Thorburn, G.D., Bassett, J.M. and Smith, I.D. 1969. Progesterone concentration in the peripheral plasma of sheep during the oestrous cycle. Journal of Endocrinology 45: 459–469.10.1677/joe.0.0450459CrossRefGoogle ScholarPubMed