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Inverse relationship between concentration of progesterone and nutrition in ewes

Published online by Cambridge University Press:  27 March 2009

A. H. Williams  and
I. A. Cumming
A. H. Williams
Affiliation:
Victorian Department of Agriculture, Animal Research Institute, Werribee, Victoria 3030, Australia
I. A. Cumming
Affiliation:
Victorian Department of Agriculture, Animal Research Institute, Werribee, Victoria 3030, Australia
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Summary

Mean progesterone concentrations were measured in the peripheral plasmas of Merino and Border Leicester × Merino ewes which were fed from day 2 to day 16 after mating on rations designed to provide twice maintenance (2 M), maintenance (M) and one quarter maintenance (¼ M) of food requirements. Mean plasma progesterone concentrations were consistently higher in the ¼ ewes than in the M or 2 M ewes whether they had two corpora lutea (CL) and two embryos surviving or one CL with either one embryo surviving or no embryo surviving, and tended to be lower in the 2 M than M ewes. It is concluded that there is an inverse relationship between levels of nutrition and progesterone within an oestrous cycle in ewes.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 98 , Issue 3 , June 1982 , pp. 517 - 522
Copyright
Copyright © Cambridge University Press 1982

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References

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