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A note on ovulation rate and embryonic survival in D'man ewes

Published online by Cambridge University Press:  02 September 2010

A. Lahlou-Kassi  and
M. Marie
A. Lahlou-Kassi
Affiliation:
Department of Reproduction and Artificial Insemination, Hassan II Agronomic and Veterinary Institute, Rabat, Morocco
M. Marie
Affiliation:
Department of Reproduction and Artificial Insemination, Hassan II Agronomic and Veterinary Institute, Rabat, Morocco
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Abstract

The elements of prolificacy have been analysed for the D'man sheep, a prolific Moroccan breed, by laparotomy on 38 animals. The average ovulation rate was 2·50 (s.e.0·45); a slight difference was observed between nulliparous and multiparous ewes due to high simultaneous activity by both ovaries in the latter group. Embryonic survival (42% overall) was 94% (87 to 100%) for multiparous and 44% (36 to 52%) for the nulliparous ewes at one ovulation, decreasing with increasing numbers of corpora lutea. The average litter size showed an optimum at four ovulations.

Information

Type
Research Article
Information
Animal Production , Volume 32 , Issue 2 , April 1981 , pp. 227 - 229
Copyright
Copyright © British Society of Animal Science 1981

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References

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