Current hypotheses for the control of seasonality are based on the premise that seasonal changes in sensitivity to ovarian steroid hormones drive changes in reproductive status. Most studies have used the ovariectomised, oestrogen-treated ewe as an experimental model, but such animals may be influenced by previous entrainment or exposure to gonadal steroids. This study uses an infertile animal - the homozygous Inverdale ewe - as a unique

BJ, McLeod, SE Kyle, and MR Ramsay

Proceedings of the New Zealand Society of Animal Production, Volume 56, , 367-369, 1996
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