Summary. Nineteen Scottish Blackface ewes were given LH-RH (3 × 30 μg i.v., 90-min intervals) during anoestrus when prolactin levels were elevated. Plasma levels of prolactin were suppressed with CB 154 (twice daily, i.m.) on Days −5 to 0 (N = 5), 0 to +5 (N = 5) or −5 to +5 ( N = 5) around the day of LH-RH treatment (Day 0). Control animals (N = 4) received saline on Days −5 to +5. Nine animals ovulated forming corpora lutea as judged by laparoscopy on Day +7. No difference in FSH or LH levels was found between treatments and ovulations occurred equally in all treatment groups. Progesterone levels were < 1 ng/ml in all animals up to Day 14. It is concluded that short-term suppression of prolactin does not affect the incidence of ovulation or corpus luteum progesterone production in LH-RH-treated anoestrous ewes.
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