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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

Gordon, I. 1971. Controlling reproduction in the ewe for intensive systems. In Proceedings of the National Sheep Conference, 1969 (Blackpool). Meat and Livestock Commission, Bletchley (in press).Google Scholar
Lightfoot, R. J. 1970. The contractile activity of the genital tract of the ewe in response to oxytocin and mating. J. Reprod. Fert. 21: 376.CrossRefGoogle ScholarPubMed
Quinlivan, T. D. and Robinson, T. J. 1967. The number of spermatozoa in the Fallopian tubes of ewes at intervals after artificial insemination following withdrawal of SC-9880-impregnated intravaginal sponges. In The Control of the Ovarian Cycle in the Sheep (ed. Robinson, T. J.), pp. 177–194. Sydney Univ. Press.Google Scholar
Quinlivan, T. D. and Robinson, T. J. 1969. Numbers of spermatozoa in the genital tract after artificial insemination of progestagen-treated ewes. J. Reprod. Fert. 19: 73–86.CrossRefGoogle ScholarPubMed
Robinson, T. J. 1965. Use of progestagen impregnated sponges inserted intravaginally or subcutaneously for the control of the oestrus cycle in sheep. Nature, Lond. 206: 39–41.CrossRefGoogle ScholarPubMed
Robinson, T. J. 1969. Synchronisation of the oestrus cycle and fertility. Proc. 6th int. Congr. Anlm. Reprod. A.I. (Paris) 1968, 2: 1347–1383.Google Scholar
Robinson, T. J. and Moore, N. W. 1967. The evaluation of progesterone and SC-9880-impregnated intravaginal sponges for the synchronisation of oestrus for large scale A.I. of Merino ewes in Spring. In The Control of the Ovarian Cycle in the Sheep (ed. Robinson, T. J.), pp. 116–132. Sydney Univ. Press.Google Scholar
Ryan, P. O. M. 1969. Studies in the hormonal control of ovulation and simplification of A.I. techniques in sheep. M. Agr. Sc. Thesis. Nat. Univ. Ireland, Dublin.Google Scholar