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In contrast to hypophysectomy, pituitary stalk section in the sheep on any day of the oestrous cycle permits a continued secretion of progesterone which is comparable to that of normal animals (Denamur, Martinet & Short, 1966). These authors postulated that the maintenance of the secretory ability of the corpus luteum after stalk section must be due in part to the continued release of pituitary prolactin. Measurements of plasma prolactin during the normal oestrous cycle of the sheep and after section of the stalk were carried out to verify the hypothesis, and the results are shown in Table 1.

Samples from three normal ewes (E1, E 2 and E 3) were taken daily at 07.00 h from the jugular vein. The onset of oestrus was detected by testing with vasectomized rams six times a day (06.00 h, 07.30 h, 09.00 h, 15.30 h, 17.00 h and 18.30 h). All samples were