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A note on seasonal changes in litter size of Finn × Awassi ewes

Published online by Cambridge University Press:  02 September 2010

D. Amir ,
H. Schindler  and
A. Genizi
D. Amir
Affiliation:
Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
H. Schindler
Affiliation:
Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
A. Genizi
Affiliation:
Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
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Abstract

The twinning rate of Finn × Awassi ewes in a breeding management system which included three breeding periods a year, namely, June, September and December-January, was studied in animals mated at their natural or induced oestrus.

A similar number of lambs per ewe lambing was obtained from the ewes mated either at the induced oestrus in June or September, or at their natural oestrus in December. A significant decrease was found in the twinning rate of the ewes mated in January after hormone treatment. The conception rate was highest in the ewes mated in December-January.

Type
Research Article
Information
Animal Production , Volume 32 , Issue 1 , February 1981 , pp. 121 - 123
Copyright
Copyright © British Society of Animal Science 1981

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References

REFERENCES

Amir, D. and Schindler, H. 1977. [Induction of oestrus and fertility of ewes at the beginning and the end of the sexual season.] Hassadeh 57: 1663–1667.Google Scholar
Ampy, F. R. and Rottensten, K. V. 1968. Fertility in the Awassi sheep. I—Seasonal influence on fertility. Trop. Agric, Trin. 45: 191–197.Google Scholar
Averill, R. L. W. 1955. Fertility of the ewe. In Studies on Fertility (ed. Harrison, R. G.), Vol. 7, pp. 139–148. Blackwell, Oxford.Google Scholar
Dun, R. B., Ahmed, W. and Morrant, A. J. 1960. Annual reproductive rhythm in Merino sheep related to the choice of a mating time at Trangie, Central Western New South Wales. Aust. J. agric. Res. 11: 805–826.CrossRefGoogle Scholar
Fletcher, I. C., Geytenbeek, P. E. and Allden, W. C. 1970. Interaction between the effects of nutrition and season of mating on reproductive performance in crossbred ewes. Aust. J. exp. Agric. Anim. Husb. 10: 393–396.CrossRefGoogle Scholar
Goot, H., Folman, Y., Drori, D. and Eyal, E. 1975. [The Finn × Awassi cross of sheep (preliminary results).] Hassadeh 55: 1881–1883.Google Scholar
Hafez, E. S. E. 1952. Studies on the breeding season and reproduction of the ewe. Parts I to V. J. agric. Sci., Camb. 42: 189–265.CrossRefGoogle Scholar
Johansson, I. and Hansson, A. 1943. The sex ratio and multiple births in sheep. Lantbr Högsk. Annlr. 11: 145–171.Google Scholar
Pak, V. F. 1969. [The effect of age on lambing rate of Precoce ewes.] Trudy ural'. nauchno-issled. Inst. sel'. Khoz 8: 245–247.Google Scholar
Reeve, E. C. R. and Robertson, F. W. 1953. Factors affecting multiple births in sheep. Anim. Breed. Abstr. 21: 211–224.Google Scholar