Gonadotrophin-inhibiting activity in seminal plasma from intact and vasectomized bulls

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Abstract
Bull seminal plasma administered to male rats at the time of castration inhibited the rise in the levels of follitropin and lutropin otherwise seen in the serum 24 h later. That the gonadotropin-inhibiting activity was also present in the seminal plasma from vasectomized bulls suggests that it was not of testicular origin. Although the substance with gonadotropin-inhibiting activity was a protein, it may be chemically distinct from inhibin.