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REPRODUCTIVE POTENTIAL OF THE MALE RAT: ENHANCEMENT OF COPULATORY LEVELS FOLLOWING LESIONS OF THE MAMMILLARY BODY IN SEXUALLY NON-ACTIVE AND ACTIVE ANIMALS

Experimenters interested in determining the pattern of copulatory activity in the male rat invariably select a sample of animals found to be active copulators during a series of pre-experimental trials. Various investigators have observed that a certain percentage of seemingly healthy males refuse to copulate under standard testing conditions (Whalen, Beach & Kuehn, 1961). In my studies I define 'active copulators' as males which mate on a minimum of 4 out of 14 nights when in the constant presence of a stimulus female. In some samples, 40% fail to meet this criterion (Lisk, 1966).

Grunt & Young (1952, 1953) found that changes in the level of androgens exceeding maintenance levels did not influence the sex drive in guinea-pigs. Larsson (1966) found this to be true for the rat also. Androgen therapy has

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