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Sperm transport after non-surgical intrauterine insemination with frozen semen in ewes treated with prostaglandin F-2

It has been suggested that poor fertilization rates in sheep treated with progestagens are due to an effect on sperm transport (Hancock, 1962; Quinlivan & Robinson, 1969; Hawk & Conley, 1972). Hawk (1973) considered that treatment with prostaglandin (PG) F-2 also affected sperm transport adversely, but Edqvist, Einarsson & Gustafsson (1975) have reported that more spermatozoa are present in the uterus and oviducts of PG-treated sheep 10 min after insemination with frozen–thawed semen. Fukui & Roberts (1976a, b) found that intrauterine insemination by a method similar to that of Andersen, Aamdal & Fougner (1973) resulted in comparable rates of fertilization and lambing when frozen–thawed and fresh–undiluted semen were used.