INAUGURAL ONE-DAY MEETING, 20th AUGUST 1968 Held at C.S.I.R.O., Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, N.S.W., Australia Edited on behalf of the Society by B. P. SETCHELL, K. W. CLELAND and T. J. ROBINSON Chairman: Dr G. A. ALEXANDER Ovarian blood flow in sheep during the oestrous cycle. P. E. Mattner. C.S.I.R.O. Division of Animal Physiology, Prospect, N.S.W. Blood was collected from both ovaries simultaneously in anaesthetized ewes by inserting a large bore polyvinyl catheter into each utero-ovarian vein. The tributaries of the utero-ovarian veins, excepting the ovarian veins, were ligated. Blood-flow rates from the ovulatory and the non-ovulatory ovaries were similar at each stage of the oestrous cycle and varied cyclically. The rates were elevated during the luteal stage of the cycle and were low near oestrus. Secretion of oestradiol-17β continued throughout the oestrous cycle with peaks of output occurring at oestrus and at
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