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Thyroid and Ovarian Hormones in Ewes Treated with Gestagen and Pmsg in Spring

BEKEOVA E, KRAJNICAKOVA M, HENDRICHOVSKY V, MARACEK I
Veterinarni Medicina 40, 1995, 345-352

Recent experimental observations have shown that the thyroid gland plays a dominant part in the induction and maintenance of anoestrus in ewes. The mechanisms of the anoestrous effects of the thyroid gland are still unclear. On the basis of experiments, in which after thyroidectomy at the onset of sexual activity LH production was maintained also during the spring months, iodothyronines have been supposed to stimulate the inhibitory effects of oestrogens upon the neuroendocrine centres that generate pulsatile LH secretion (Moenter et al., 1991


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