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Oestrous activity in three subtropical sheep breeds in Upper Egypt and response to long-day light treatment

Published online by Cambridge University Press:  27 March 2009

A. M. Aboul-Naga ,
H. Mansour ,
M. B. Aboul-Ela ,
M. T. Mousa ,
Ferial Hassan  and
F. El-Hommosi
A. M. Aboul-Naga
Affiliation:
Animal Production Research Institute, Ministry of Agriculture, Dokki, Cairo, Egypt
H. Mansour
Affiliation:
Faculty of Agriculture, University of Ain-Shams, Cairo, Egypt
M. B. Aboul-Ela
Affiliation:
Faculty of Agriculture, University of Mansoura, Mansoura, Egypt
M. T. Mousa
Affiliation:
Animal Production Research Institute, Ministry of Agriculture, Dokki, Cairo, Egypt
Ferial Hassan
Affiliation:
Animal Production Research Institute, Ministry of Agriculture, Dokki, Cairo, Egypt
F. El-Hommosi
Affiliation:
Faculty of Agriculture, University of Assuit, Assuit, Egypt
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Summary

Oestrous activity in local Rahmani and Ossimi sheep and imported subtropical Awassi sheep at different times of the year in Upper Egypt and the effect of continuous exposure to long-day conditions from July till December on this activity was studied in 1986. The three breeds differed substantially in oestrous activity but differences did not seem to be directly related to latitude of origin. Rahmani ewes from the Nile Delta were mostly cyclic all year round; the percentage coming to oestrus each month never fell below 70%. Ossimi ewes originating from mid-Egypt had a very long breeding season; 74% had an anoestrous period of 68·8 days (v. 27% for Rahmani ewes). All Awassi ewes, except one, had an anoestrous period of 96·5 days on average.

Awassi ewes also showed more response to continuous exposure to long days (14 h) than Ossimi ewes, seen in a shorter reaction interval and a greater decrease in the percentage of ewes coming into oestrus (27 and 90% in control and treated Awassi ewes, respectively). The results indicated that changes in daylength, although small in subtropical regions, may be a major factor controlling seasonal changes in reproductive activity in subtropical sheep breeds, the more seasonal breed being more responsive to changes in daylength. The possibility of selection within these breeds for continuous reproductive activity is also indicated.

Type
Animals
Information
The Journal of Agricultural Science , Volume 116 , Issue 1 , February 1991 , pp. 139 - 143
Copyright
Copyright © Cambridge University Press 1991

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References

REFERENCES

Aboul-Ela, M. B. & Chemineau, P. (1989). Seasonality of reproductive activity in native sheep and goat breeds and their crosses with introduced breeds. Proceeding of Workshop on Small Ruminant Research and Development in the Near East, Cairo, 2–4 November, 1988, pp. 74–87. IDRC Publication.Google Scholar
Aboul-Naga, A. M. (1985). Crossbreeding for fecundity in subtropical sheep. In Genetics of Reproduction in Sheep (Eds Land, R. & Robinson, D.). London: Butterworths.Google Scholar
Aboul-Naga, A. M. & Aboul-Ela, M. B. (1984). Oestrous activity of Egyptian fat-tailed Ossimi ewes raised at different locations. Journal of Agricultural Science, Cambridge 103, 481–488.CrossRefGoogle Scholar
Aboul-Naga, A. M. & Aboul-Ela, M. B. (1989). Manipulation of sexual activity in subtropical Egyptian sheep. 40th Annual Meeting of the European Association for Animal Production, Dublin, Ireland, 27–31 August, 1989.Google Scholar
Aboul-Naga, A. M., Aboul-Ela, M. B., El-Nakhla, S. & Mehrez, A. Z. (1987). Oestrous and ovarian activity of subtropical fat-tailed Rahmani sheep and their response to light treatment. Journal of Agricultural Science, Cambridge 108, 617–621.CrossRefGoogle Scholar
Aboul-Naga, A. M., Aboul-Ela, M. B. & Mansour, H. (1987). Seasonality of breeding activity in subtropical Egyptian sheep breeds. 36th Annual Meeting of the European Association of Animal Production, Lisbon, Portugal, 28 September–1 October 1987.Google Scholar
Amir, D. & Volcani, R. (1965). The sexual season of the Awassi fat-tailed ewe. Journal of Agricultural Science, Cambridge 64, 83–85.Google Scholar
Barr, A. M. (1968). Preliminary studies on oestrus cyclic phenomena of the Awassi ewes in Lebanon. Magon 24, 1–16.Google Scholar
Bishop, Y. M., Fienberg, S. E. & Holland, P. W. (1975). Discrete Multivariate Analysis Theory and Practice. Cambridge, MA: MIT Press.Google Scholar
Crosby, T. F. & O'Callaghan, D. (1988). Effect of melatonin bolus or progesterone sponge plus pregnant mare serum gonadotrophin treatment on oestrus response and lambing outcome in ewes. 11th International Congress on Animal Reproduction and Artificial Insemination, Dublin, Ireland, 26–30 June 1988, pp. 430–432.Google Scholar
Ducker, M. J. & Bowman, J. C. (1970). Photoperiodism in the ewe. 3. The effect of various patterns of increasing daylength on the onset of anoestrus in Clun Forest ewes. Animal Production 12, 465–471.Google Scholar
Hafez, E. S. E. (1952). Studies on the breeding season and reproduction of the ewe. Journal of Agricultural Science, Cambridge 42, 189–265.CrossRefGoogle Scholar
Galal, E. S. E. (1987). Sheep and goat production research and development in Egypt. Small Ruminants in the Near East, FAO Animal Production and Health, Vol. 1, paper 54. Rome: FAO.Google Scholar
Schindler, H. D. & Amir, D. (1972). Length of oestrus duration of phenomena related to oestrus and ovulation time in the local fat-tailed Awassi ewe. Journal of Agricultural Science, Cambridge 78, 151–156.Google Scholar
Sefidbakht, N., Mostafavi, M. S. & Farid, A. (1978). Annual reproductive rhythm and ovulation rate in four fat-tailed sheep breeds. Animal Production 26, 177–184.Google Scholar