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Artificial insemination and natural service at a predetermined time in cyclic sheep treated with ‘SC-9880’-progesterone sponges

Published online by Cambridge University Press:  02 September 2010

T. H. McClelland  and
J. F. Quirke
T. H. McClelland
Affiliation:
A.R.C. Animal Breeding Research Organisation, Edinburgh EH9 3JQ
J. F. Quirke
Affiliation:
Meat and Livestock Commission, Edinburgh EH9 3JQ
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Summary

Results are given of an experiment in which 61 cyclic Finnish Landrace × Dorset Horn ewes were synchronized for oestrus by intravaginal treatment for 14 days using sponges impregnated with 30 mg ‘Cronolone’ (9a-fluro-11-hydroxy-17a-acetoxy-progesterone; SC-9880, G. D. Searle) and 400 mg progesterone. Groups of 31 and 30 sheep were inseminated twice, either artificially or naturally, at predetermined intervals of 48 and 58 hr after sponge withdrawal. All 61 ewes were in oestrus within 48 hr of removing sponges; 26 of 30 (87%) artificially inseminated and 29 of 31 (94%) hand-mated sheep conceived at the controlled oestrus. The incidence of multiple births was not significantly affected by the method of breeding.

Type
Research Article
Information
Animal Production , Volume 13 , Issue 2 , May 1971 , pp. 323 - 327
Copyright
Copyright © British Society of Animal Science 1971

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References

REFERENCES

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