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Protected fat and donor age effects on plasma total lipid level, plasma progesterone concentration, embryo yield and quality following superovulation in sheep

Published online by Cambridge University Press:  20 November 2017

AG Onal
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK University of Aberdeen, Department of Agriculture, 581 King Street, Aberdeen AB9 1UD, UK
JJ Robinson
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
ME Staines
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
BK Speake
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
JSM Hutchinson
Affiliation:
University of Aberdeen, Department of Agriculture, 581 King Street, Aberdeen AB9 1UD, UK
ME King
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
M Kuran
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
FE Gebbie
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
TG McEvoy
Affiliation:
Scottish Agricultural College, Animal Biology Division, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK
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Extract

Supplements of dietary fat are highly effective in boosting energy intake at critical phases during the reproductive cycle. When fed to ruminants in the form of calcium salts of fatty acids, they have been shown to increase plasma cholesterol and progesterone levels (Spicer et al, 1993) which, in turn, could have beneficial effects on ovulation rate and embryo quality. In sheep, a likely reproductive state for a physiological response to a lipid supplement is during the superovulation of young animals in which the post-ovulatory steroidogenic capacity of the corpora lutea may be sub-optimal. The present study examined the effects of donor age and dietary fat on plasma progesterone concentration, and the yield and quality of embryos in superovulated Cheviot sheep.

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Copyright
Copyright © The British Society of Animal Science 1999

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References

Spicer, L.J., Verron, R.K., Tucker, R.P., Wettemann, R.P. and Adams, G.D. (1993). Effects of protected fat on plasma concentrations of cholesterol and progesterone in lactating dairy cows. Oklahoma State University Animal Science Research Report, pp. 175178.Google Scholar
Onal, A.G., Robinson, J.J., Speake, B.K.,. Dolman, D.F., Watt, R.G., King, M.E., Coull, G.D. and McEvoy, T.G. (1998). Dietary lipid and donor age effects on sheep embryo yield and quality following superovulation. Journal of Reproduction and Fertility, Abstract Series 21:48 Google Scholar