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Animals with unilateral or bilateral lesions, with respectively 85 and 70% of intact preoptic area tissue remaining, returned to regular oestrous cycles. By comparison with sham-operated controls, rats with lesions had more days with a leucocytic smear in each of the 1st, 2nd or 3rd post-operative cycle, before returning to a 4-day cycle. Hormone measurements of blood collected during the afternoon of pro-oestrus showed that, in rats with bilateral lesions, the duration of the preovulatory LH secretion was significantly shortened, although peak levels were unchanged; the initial phase of the preovulatory FSH secretion was lost; and much of the prolactin surge was also inhibited. The TSH surge was unaffected.

Preovulatory secretion of gonadotrophins and TSH in cyclic rats with small lesions in the preoptic area