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SEXUAL DIMORPHISM IN THE SUBMAXILLARY GLAND OF THE PIG

A biochemical sexual dimorphism exists in the submaxillary gland of the pig. Patterson (1968) identified 5-androst-16-en-3-ol and 5-androst-16-en-3-one in the submaxillary gland of boars but found none in the female pig. Booth (1972) isolated testosterone and 5-dihydrotestosterone from the submaxillary glands of boars only. These observations suggest that the submaxillary gland of the boar, like that of the male mouse (Berkman & Kronman, 1970), may be a target organ for androgen. In the mouse, hypertrophy of the granular serous tubules in the submaxillary gland is known to occur under the influence of androgen (Berkman & Kronman, 1970) and the possibility that a similar situation might exist in the pig was therefore examined. In addition, the activity of ⁵-3 β-hydroxysteroid dehydrogenase in the gland was studied histochemically.

Submaxillary glands were removed from nineteen Large White X Essex pigs of different ages, and weighed within 30 min of slaughter (see