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Effect of ram introduction upon the pulsatile release of LH and follicle development in pre-puberal ewe lambs

Published online by Cambridge University Press:  22 November 2017

N.Z. Al-Mauly ,
M.J. Bryant  and
F.J. Cunningham
N.Z. Al-Mauly
Affiliation:
Departments of Agriculture and Physiology, University of Reading, Reading, Berks
M.J. Bryant
Affiliation:
Departments of Agriculture and Physiology, University of Reading, Reading, Berks
F.J. Cunningham
Affiliation:
Departments of Agriculture and Physiology, University of Reading, Reading, Berks Departments of Agriculture and Physiology and Biochemistry, University of Reading, Reading, Berks
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Extract

The introduction of rams to seasonally-anovular ewes will, at certain times of the year, stimulate increased pulsatile release of LH, follicle development and ovulation (Martin et al., 1986). The neuroendocrine mechanism governing the transition into adulthood of ewe lambs is incompletely understood, but it is believed to be similar to that which controls the transition to the breeding season in the adult ewe (Foster, Yellon and Olster, 1985; Legan, Karsch and Foster, 1977). Thus the introduction of rams may have a similar action in the pre-puberal ewe lamb as in the seasonally-anovular adult ewe. This experiment investigated the effect of the introduction of rams on the pattern of LH secretion and follicle development in ewe lambs during the late summer/early autumn of their first year of life.

Type
Developments in Sheep Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1988 , March 1988 , pp. 95
Copyright
Copyright © The British Society of Animal Production 1988

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References

Foster, D.L., Yellon, S.M. and Olster, D.H. (1985). J. Reprod. Fert. 75: 327–344.Google Scholar
Legan, S.J., Karsch, F.J. and Foster, D.L. (1977). Endocrinology 101: 818–824.CrossRefGoogle Scholar
Martin, G.B., Oldham, C.M., Cognie, Y. and Pearce, D.T. (1986). Livest. Prod. Sci. 15: 219–247.Google Scholar