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THE TRANSPORT OF SPERMATOZOA IN SPAYED EWES: A COMPARISON OF TWO METHODS OF STEROID ADMINISTRATION

The transport of spermatozoa in spayed ewes is grossly impaired in comparison with that observed in entire animals (Allison, 1972). Although hormonal replacement regimens used resulted in a behavioural oestrus of similar duration to that recorded in entire ewes, the physiological state of the uterus was not maintained. These differences could be a result of the pattern of steroid release following single intramuscular injections. In particular, the pattern of oestrogen release following a single intramuscular injection is unlikely to resemble the patterns recorded in the entire ewe before and about the time of oestrus (Moore, Barrett, Brown, Schindler, Smith & Smyth, 1969; Smith & Robinson 1970). If the release of steroids in entire ewes could be reproduced precisely by intravenous infusion, normal transport of spermatozoa might be attainable in spayed ewes. The aim