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EFFECTS OF CASTRATION AT BIRTH IN HAMSTERS OF BOTH SEXES ON LUTEINIZATION OF OVARIAN IMPLANTS, OESTROUS CYCLES AND SEXUAL BEHAVIOUR

Administration of testosterone propionate (TP) to female golden hamsters within a few days of birth prevents the appearance of oestrous cycles and corpora lutea (Swanson, 1966) and results in depression of female sexual behaviour (Swanson & Crossley, 1969). The low level of receptivity is attributed not so much to a deficiency in ovarian secretion as to a decreased responsiveness to female hormones. In contrast to normal females, in which very little male behaviour can be elicited after ovariectomy and prolonged treatment with TP during adult life, females which had received as little as 10 µg TP as infants responded to such a régime by frequently mounting other females and showing patterns of behaviour resembling attempts at intromission.

Male hamsters castrated as adults and given oestrogen and progesterone are treated as females by intact males and respond by marked lordosis (Swanson

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				F. J. Karsch, D. J. Dierschke, and E. Knobil Sexual Differentiation of Pituitary Function: Apparent Difference between Primates and Rodents Science, February 2, 1973; 179(4072): 484 - 486. [Abstract] [PDF]