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SC-9880-progesterone applications in the induction of early breeding in sheep

Published online by Cambridge University Press:  27 March 2009

I. Gordon
I. Gordon
Affiliation:
Faculty of Agriculture, University College, Dublin
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Summary

The mating response and lambing outcome was studied in 584 sheep in twentyeight farm flocks after treatment with progestagen impregnated intravaginal sponges and PMS during June/July (period of late anoestrus). Each pessary carried a dose of 30 mg ‘Cronolone’ (9α-fluoro-11β-hydroxy-17α-acetoxy-progesterone; SC-9880, G. D. Searle) in finely dispersed form; half the number of pessaries carried an additional dose of 400 mg progesterone. Intravaginal treatment was for 12 days; a single intramuscular injection of 500 i.u. PMS (Burrough's Wellcome) was made at pessary withdrawal. Breeding was by natural service, using 10% rams. The response was 98·8% bred in the 4 days after treatment, 61·2% conceptions in those served and an average of 1·65 lambs/conception. This resulted in the birth, within the period of about 1 week, of 100 ‘early’ lambs for every 100 ewes exposed to rams. The addition of 400 mg progesterone to pessaries or the injection of a dose of 5 mg progesterone at sponge withdrawal did not improve response beyond that found with ‘Cronolone’ alone.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 3 , June 1971 , pp. 343 - 346
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

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