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In two experiments with red deer hinds we investigated (1) the sensitivity of the corpus luteum of pregnancy and the post-implantation embryo to a single injection of a prostaglandin analogue, and (2) the effects of removal of ovarian and luteal tissues on the maintenance of pregnancy. In the first experiment, groups of hinds (n = 6 per group) were given a single intramuscular injection of cloprostenol...