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Age at lambing in the autumn affects subsequent ovulation rate and duration of ovarian cyclicity in crossbred ewes

Published online by Cambridge University Press:  05 November 2021

Margaret E. King ,
Linda M. Mitchell ,
Maria J Ranilla ,
Fiona E Gebbie  and
J J Robinson
Margaret E. King
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksbum, Aberdeen AB21 9YA, Scotland
Linda M. Mitchell
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksbum, Aberdeen AB21 9YA, Scotland
Maria J Ranilla
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksbum, Aberdeen AB21 9YA, Scotland
Fiona E Gebbie
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksbum, Aberdeen AB21 9YA, Scotland
J J Robinson
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksbum, Aberdeen AB21 9YA, Scotland
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Extract

The breeding season of mature Mule (Bluefaced Leicester X Scottish Blackface) ewes at 57°N extends from September to April (King et al, 1995). Previous studies have shown that ewe lambs which become reproductively active in their first year of life have a shorter breeding season than mature ewes with both fewer and less regular oestrous cycles (Dyrmundsson, 1978a). The aim of the present study was to determine (i) whether ewes lambing in the autumn (i.e. during their natural mating season) would subsequently experience oestrous cycles and (ii) whether age has an effect on the pattern and duration of cyclicity and on ovulation rate.

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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 183
Copyright
Copyright © British Society of Animal Science 1997

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References

King, ME, Mitchell, LM, Aitken, RP and Wallace, JM (1995) The effect of management history on oestrous cyclicity in Mule ewes. Anim Sci 60, 535-6A.Google Scholar
Dyrmundsson, OR (1978) Studies on the breeding season of Icelandic ewes and and ewe lambs. J Agric Sci 90, 275–281.CrossRefGoogle Scholar