Increased Retention of Spermatozoa in the Reproductive Tract of Estrous Rabbits after Administration of Prostaglandin F2α Immediately before Insemination

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Abstract
Two experiments were conducted to determine whether prostaglandin F2α (PGF2α) administered to does immediately before natural or artificial insemination would increase the retention of sperm in the reproductive tract. The PGF2α was injected intramuscularly at 200 μg/kg of body weight. In the first experiment, 16 estrous does, eight injected intramuscularly with PG2α, were mated naturally and necropsied 3 hr later. In the second experiment, of 2 × 2 design, 32 estrous does, 16 injected with PGF2α, were inseminated artificially with either 34 or 102 million sperm and necropsied 3 hr later. After necropsy, each segment of the reproductive tract was flushed and sperm were counted. In each experiment, the PGF2α treatment increased by at least threefold the number of sperm recovered from the oviducts, uterus, cervices and vagina, as well as the total number recovered from the reproductive tract. The PGF2α treatment reduced the normal loss of sperm from the reproductive tract during the first 3 hr after insemination. Copyright © 1979. American Society of Animal Science . Copyright 1979 by American Society of Animal Science.