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Biology of Reproduction, Vol 15, 402-405, Copyright © 1976 by Society for the Study of Reproduction

Improvement of Sperm Transport in Estrous Rabbits by Exogenous Estradiol

H. W. HAWK 1, and B. S. COOPER 1

1 Reproduction Laboratory, Animal Physiology and Genetics Institute, USDA, Agricultural Research Center, Beltsville, Maryland 20705


In an experiment of 2 x 4 factorial design, 80 virgin estrous does (10 per group) were given an intramuscular injection of either corn oil or 1 µg of estradiol-17beta in corn oil. The does were mated 1 h after treatment and killed 1, 2.5, 5 or 10 h after mating. The oviducts, uterine horns, cervices and vagina were flushed separately and sperm cells in the flushings were counted. Estradiol treatment caused significant increases in sperm cell numbers in the oviducts at 1 and 2.5 h, in the uterine horns at 1, 2.5 and 5 h, and in the cervices at 2.5 h. Effects of estradiol on sperm cell numbers were not seen at 10 h. The results indicate that exogenous estradiol increased the numbers of sperm cells in the oviducts and uterine horns as early as 2 h after administration of the hormone, which was 1 h after mating.

Submitted on May 7, 1976
Accepted on June 6, 1976






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Copyright © 1976 by the Society for the Study of Reproduction.