“…ewes (Morris and Sass, 1966) are greatly developed in size and number when functional CL are present on the ovary. Furthermore, blood flow to and lymph flow from the ovary is highest during the luteal phase of the estrous cycle and lowest after luteal regression in sheep (Lindner et al, 1964;Niswender et al, 1975) and guinea pigs (Culiner, 1944;Hossain et al, 1979). The rate of lymph flow of ovaries containing an active CL and blood flow to the CL were much higher per unit weight of tissue than any other organ studied in the ewe (Lindner et al, 1964;Christenson and Prior, 1978).…”