The effects of nutrition oestradiol, phenobarbital and carbon
tetrachloride on ovulation rate and plasma FSH in ewes
E. Payne, J.F. Smith, A.J. Peterson, L.T. McGowan, B.C. Cope, R.
McLaughlin
MAF Technology, Ruakura Agricultural Centre, Hamilton
Proceedings of the New Zealand Society of Animal Production.
1990, 50: 149-154
IN a factorial experiment involving 4 treatment affecting
ovulation rate and 20 ewes per cell the effect of oestradiol was
dominant, reducing the ovulation rate. In the non-oestradiol treated
ewes a positive effect of high protein intake was evident.
Phenobarbital increased ovulations in ewes on a low protein diet whilst
carbon tetrachloride (CC14) had a slight negative effect only on the low
protein diet. Neither phenobarbital or CC14 had any effect on the high
protein diet. There was a decrease in plasma FSH at day 11 with
oestradiol, protein and phenobarbital and an increase with CC14. Hence
an increase in FSH does not always accompany increases in ovulation
rate.
Keywords: NZSAPAB;
Ovulation rate; ewes; FSH; oestradiol; phenobarbital; protein;
carbon tetrachloride
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Last Updated 25-01-1997
