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In recent years, interest in the role played by oviduct fluids in reproduction has increased. With the development of a method for the continuous collection of oviduct fluid from the rabbit (Clewe & Mastroianni, 1960) it became possible to measure the rate of oviduct secretion in the unanaesthetized animal. By slightly modifying their collection apparatus, oviduct fluid was collected from the ewe by Black, Duby & Reisen (1963) and more recently by Perkins, Goode, Wilder & Henson (1965), Restall & Wales (1966) and Wales & Restall (1966). The oviduct provides a liquid medium for gametes during transport and fertilization. Whether this fluid does more than provide a protective environment is unknown. Spermatozoan respiration is stimulated by oviduct fluid from the cow (Olds & VanDemark, 1957), rabbit (Hamner & Williams, 1963) and ewe (Black, Crowley, Duby & Spilman, 1966; Wales & Restall, 1966). It has been suggested (Wales & Restall, 1966) that the stimulatory effect of oviduct fluid on spermatozoan respiration is due to the presence of substrate. Little attention has been given to the respiration stimulatory properties of oviduct fluid collected at various times during the oestrous cycle. Since the composition of oviduct fluid changes with the endocrine state of the animal, it seems likely that these changes would manifest themselves in the effect the fluid has on spermatozoan respiration. These studies were undertaken to determine whether or not the ability of oviduct fluid to stimulate spermatozoan respiration changes during the oestrous cycle. In addition, the efficacy of the methods used in the collection of oviduct fluid was evaluated. Twenty ewes demonstrating normal oestrous cycles were used in this study. Collection of oviduct fluid was carried out between September and January of 2 years. A collection device was attached to each animal as previously described (Black et al., 1963). The collection device was slightly modified by substituting a soft plastic vial and case for the collection chamber embedded in a solid plastic block. The plastic vial in which oviduct secretions accumulated

OVIDUCT SECRETION IN THE EWE AND THE EFFECT OF OVIDUCT FLUID ON OXYGEN UPTAKE BY RAM SPERMATOZOA IN VITRO