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Seasonal anoestrus in the ewe results from enhanced oestrogen negative feedback.
2
This study addressed whether NO acts within the vmPOA to inhibit LH during seasonal anoestrus.
3
It is concluded that long post-partum anoestrus leads to prolonged calving intervals and poor reproductive performance.
4
Oestradiol was slightly less effective in eliciting oestrous behaviour in anoestrus and during the transition to the breeding season than at other times.
5
In the first experiment, LH pulse frequency was measured on days 0, 1, 7 and 14 of treatment during seasonal anoestrus.
6
Taken together, the results of Experiments 1-3 suggested that NO inhibition may be stronger during the middle than at the end of seasonal anoestrus.