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Fluids instilled into the rabbit vagina are prevented from passing further along the tract by the valve-like disposition of the uterine cervix. In the present study, vaginal spermatozoa were killed at 2 or 5 min after coitus by instillation of 12 to 16 ml of 1% lauryl sulphate (sodium dodecyl sulphate) into the anterior vagina. When the vaginal spermatozoa were killed 2 min after a single mating, only 25% of eggs

THE RATE OF SPERM PASSAGE INTO THE CERVIX AFTER COITUS IN THE RABBIT