THE TRANSPORT OF SPERMATOZOA IN THE DOG

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Abstract
Bilateral fistulae at the apices of the uterine horns were established in the bitch by simple surgical procedure (which is described). The bitch was allowed to copulate with a normal dog during natural estrus. Time was recorded for periods of active copulation, when the sperm arrived at the fistula openings, etc. The average copulation time was about 25 sec. 30-50 sec. after ejaculation, masses of spermatozoa appeared at the fistula openings. Sperm suspensions continue to flow from the openings for 3-5 min., after which time the cloudy sperm suspension is replaced by a clear secretion which flows from the fistulae until about 3 min. before the dogs separate. This is in agreement with the earlier experiments by Ivanow on the characteristics of ejaculation in the dog. The rapidity with which sperm suspensions are catapulted up the uterine tracts makes it appear likely that in the dog ciliary activity plays little or no role in the transport of sperm. It is more probable that sperm are transported, en masse, by the antiperis-taltic activity of the vagina and uterus.

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