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Intravaginal SC-9880-progesterone treatments in the synchronization of oestrus in cyclic sheep

Published online by Cambridge University Press:  27 March 2009

I. Gordon  and
P. G. Maher
I. Gordon
Affiliation:
Faculty of Agriculture, University College, Dublin
P. G. Maher
Affiliation:
Faculty of Agriculture, University College, Dublin
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Summary

The mating response and lambing outcome in fifty-three sheep was studied after treatment with intravaginal sponges during October (normal breeding season). Bach pessary carried a dose of 30 mg ‘Cronolone’ (9α-fluoro-11β-hydroxy-17α-acetoxyprogesterone; SC-9880, G. D. Searle) in finely dispersed form and was inserted for 14 days. Half the number of pessaries carried an additional dose of 400 mg progesterone. Breeding was by natural service, using 10% rams. Ninety per cent of the fifty ewes bred immediately after treatment conceived; the average number of lambs/conception was 1·9. Sheep treated with ‘Cronolone’/progesterone pessaries showed a marginal and non-significant advantage over those treated with ‘Cronolone’. The application was effective in ensuring the birth of most lambs (87% of total) within a period of 1 week.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 3 , June 1971 , pp. 361 - 363
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Gordon, I. (1971a). Induction of early breeding in sheep by standard and modified progestagen-PMS treatments. J. agric. Sci., Camb. 76, 337.CrossRefGoogle Scholar
Gordon, I.(1971b). Intravaginal oestradiol-progestagen treatments in the induction of early breeding in sheep. J. agric. Sci., Camb. 76, 335.Google Scholar
Gordon, I. & Maher, P. G. (1971). Intravaginal stilbyboestrol-progestagen treatments in the induction of early breeding in sheep. J. agric. Sci., Camb. 76, 365–7.CrossRefGoogle Scholar