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On the occurrence of oestrus in pregnant Barki and Merino ewes

Published online by Cambridge University Press:  27 March 2009

A. A. Younis  and
E. A. Afifi
A. A. Younis
Affiliation:
Department of Animal Production, Desert Institute, Mataria, Cairo, Egypt
E. A. Afifi
Affiliation:
Department of Animal Production, College of Agricultural Sciences, Moshtohor, Kalubia, Egypt
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Extract

The incidence of oestrus in pregnant ewes has been reported previously by Williams et al. (1956) and Bichard et al. (1974). However, their investigations were not designed specifically to study such a phenomenon and the number of animals employed was small. None of the factors affecting oestrus occurrence was investigated. Under experimental conditions, vasectomized or aproned rams are sometimes used after the removal of fertile rams to detect embryonic failure in pregnant ewes. It is of interest to check on the validity of this method. This study was carried out to obtain an estimate of the incidence of oestrus in early pregnancy using relatively large numbers of fat-tailed Barki and imported Hungarian Merino ewes and to investigate the effect of year, breed of ewe and age of ewe on its occurrence.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 92 , Issue 2 , April 1979 , pp. 505 - 506
Copyright
Copyright © Cambridge University Press 1979

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References

Bichard, M., Younis, A. A., Forrest, P. A. & Cumberland, P. H. (1974). Analysis of production records from a lowland sheep flock. 4. Factors influencing the incidence of successful pregnancy in young females. Animal Production 19, 177–191.Google Scholar
Fahmy, M. H., Galal, E.Salah, E., Ghanem, Y. S. & Khishin, S. S. (1969). Crossbreeding of sheep under semi-arid conditions. Animal Production 11, 351–360.Google Scholar
Harvey, W. R. (1960). Least squares analysis of data with unequal subclass numbers, U.S.D.A. Research Services. ARS 20–8, Washington, D.C.Google Scholar
Shutt, D. A. (1976). The effect of plant oestrogens on animal reproduction. Endeavour 35, 110–113.CrossRefGoogle ScholarPubMed
Williams, S. M., Garrigus, U. S., Norton, H. W. & Nalbandov, A. V. (1956). The occurrence of oestrus in pregnant ewes. Journal of Animal Science 15, 978–983.CrossRefGoogle Scholar
Younis, A. A. (1977). Increasing ewe fertility in Arab Countries. World Review of Animal Production 13, 31–36.Google Scholar