[Effect of thyroid hormones on the function of the hypothalamus-pituitary-ovary system in female rats]

No elevation of the LH-RH level in the hypothalamus, and of the LH in the blood, observed in intact animals, occurred in sexually mature female rats after thyroidectomy. The cyclic character of the changes in the blood estrogen content persisted in the operated on rats, although to a lesser degree. Thus, the influence of the thyroid glands on the gonads was realized not only at the peripheral level, but also at the level of the hypothalamo-hypophysial system.