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LH secretion in response to a surge-inducing dose of estradiol (50 μg/animal) in control female sheep (n=6), Flu rams (n=7) and control rams (n=7). Blood samples were collected every 2 h from 4 h before estradiol was injected until 30 h after injection. All 6 females met the criterion for an LH surge defined as LH values exceeding twice the average pre-estradiol baseline for a minimum of 6h. No males met this criterion. Values are mean ± SEM.
