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),
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