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Effect of restricted food intake before and/or after mating on FSH, LH and progesterone profiles in greyface ewes.

Published online by Cambridge University Press:  22 November 2017

S. McMillen ,
S.M. Rhind ,
R.G. Gunn  and
W.A.C. McKelvey
S. McMillen
Affiliation:
Macaulay Land Use Research Institute, Bush Estate, Penicuik, Midlothian EH26 OPY
S.M. Rhind
Affiliation:
Macaulay Land Use Research Institute, Bush Estate, Penicuik, Midlothian EH26 OPY
R.G. Gunn
Affiliation:
Macaulay Land Use Research Institute, Bush Estate, Penicuik, Midlothian EH26 OPY
W.A.C. McKelvey
Affiliation:
Macaulay Land Use Research Institute, Bush Estate, Penicuik, Midlothian EH26 OPY
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Extract

Low levels of food intake before or after mating are associated with increased ova wastage rates (Rhind, McKelvey, McMillen, Gunn and Elston (1989). The relationship between level of food intake, circulating progesterone concentrations and ova wastage rates in the ewe during the first 2 weeks after mating are poorly understood; low levels of food intake are associated with increased circulating progesterone concentrations and rates of ova wastage while low circulating levels of progesterone have also been shown to be associated with increased ova wastage. The aim of this experiment was to investigate the effects of undernutrition on circulating concentrations of the luteotrophic hormone, LH, and on progesterone and the relationship between the profiles of the two hormones, in order to better understand the mechanisms by which undernutrition affects embryo growth and survival.

Type
Sheep
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1989 , March 1989 , pp. 114
Copyright
Copyright © British Society of Animal Production 1989

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References

McNeilly, A.S. and Fraser, H.M. 1988. Effect of GnRH agonist-induced suppression of LH and FSH on follicle growth and corpus luteum function in the ewe. Journal of Endocrinology, 115, 273–282.CrossRefGoogle Scholar
Rhind, S.M., McKelvey, W.A.C., McMillen, S., Gunn, R.G. and Elston, D.A. 1989. Effect of restricted food intake, before and/or after mating, on the reproductive performance of Greyface ewes. Animal Production, 48, In press.CrossRefGoogle Scholar