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PITUITARY PROLACTIN AND THE OESTROUS CYCLE OF SOWS

Summary.: Pituitaries of slaughtered sows were assayed for prolactin with the intradermal pigeon crop gland technique. Sows were classified into three groups—follicular, early postovulatory and luteal—after gross inspection of the ovaries. Pituitary prolactin was lowest in the postovulatory group (57·6±2·4 i.u.) and highest in the luteal group (87·0±12·9 i.u.). This study indicated that the pituitary prolactin content in the sow was comparable with that reported for dairy cows and refutes previous reports of small quantities present in the swine pituitary.