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Post-partum intervals to oestrus and conception in Yankasa sheep

Published online by Cambridge University Press:  27 March 2009

O. A. Osinowo  and
Grace A. Ekpe
O. A. Osinowo
Affiliation:
Department of Animal Reproduction and A.I., National Animal Production Research Institute, Ahmadu Bello University, Zaria, Nigeria
Grace A. Ekpe
Affiliation:
Department of Animal Reproduction and A.I., National Animal Production Research Institute, Ahmadu Bello University, Zaria, Nigeria
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Extract

The potential for twice-yearly lambings by tropical sheep is well recognized (Brown, Cameron & Ngere, 1972; Goode, Linnerud & Tugman, 1980; Osinowo, 1982). In order for ewes to lamb every 6 months the rebreeding interval must be 33 days or less. Factors affecting rebreeding in post-partum ewes have been reviewed (Hunter, 1968a, b Van Niekerk, 1979).

Type
Short Notes
Information
The Journal of Agricultural Science , Volume 104 , Issue 1 , February 1985 , pp. 253 - 255
Copyright
Copyright © Cambridge University Press 1985

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References

Barker, H. B. & Wiggins, E. L. (1964a). Occurrence of post-partum estrus in fall-lambing ewes. Journal of Animal Science 23, 967–972.CrossRefGoogle Scholar
Barker, H. B. & Wiggins, E. L. (1964b). Estrual activity in lactating ewes. Journal of Animal Science 23, 973–980.CrossRefGoogle Scholar
Brown, D. E., Cameron, C. W. & Ngere, L. O. (1972). Synchronization of oestrus and early post-partum rebreeding of Nungua Blackhead sheep in Ghana. Ghana Journal of Agricultural Science 5, 183–187.Google Scholar
Goode, L., Linnerud, A. C. & Tugman, D. F. (1980). Sheep: reproductive performance of straight-bred and crossbred Barbados Blackbelly ewes. International Goat and Sheep Research 1, 216–225.Google Scholar
Hunter, G. L. (1968a). Increasing the frequency of pregnancy in sheep. I. Some factors affecting rebreeding during the post-partum period. Animal Breeding Abstracts 36, 347–378.Google Scholar
Hunter, G. L. (1968b). Increasing the frequency of pregnancy in sheep. II. Artificial control of rebreeding, and problems of conception and maintenance of pregnancy during the post-partum period. Animal Breeding Abstracts 36, 633–553.Google Scholar
Osinowo, O. A. (1982). Oestrus synchronization, artificial insemination and early rebreeding in Yankasa sheep. Nigerian Journal of Animal Production 9, 107–111.CrossRefGoogle Scholar
Van Niekerk, C. H. (1979). Limitations to female reproductive efficiency. In Sheep Breeding, 2nd ed. (ed. Tomes, G. J., Robertson, D. E. and Lightfoot, R. J.), pp. 303–313. London: Butterworths.CrossRefGoogle Scholar