Effect of Oxytocin on Sperm Numbers in Spontaneous Rat Ejaculates

Abstract

Male rats were allowed to copulate with receptive females until they had achieved 2 ejaculations. They were then divided in 2 groups, 1 group treated daily during 4 days with oxytocin, 1 I.U. and the other with saline. It was found that the frequency, weight and sperm content of spontaneous ejaculates were reduced after copulation and that oxytocin could partially offset the reductions in these variables, especially with regard to the number of sperm in the ejaculates.