A description is given of a technique devised to allow repeated endoscopic observations to be made of ovarian changes occurring during an oestrus cycle in the ewe. The use of a chronic peritoneal fistula is illustrated and the methods used to maintain its patency discussed. The technique was carried out in a small number of ewes and the ovarian changes occurring in an ovary of one of these ewes, over a 22 day period, are shown in photographic and diagrammatic form.
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