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Influence of castration of the neonatal rat on the pharmacological reactivity of the isolated vas deferens.

The present study was undertaken to analyze the effects of castration of neonates performed on Days 1, 3, 5, 10, and 15 after birth on the development of the male accessory genitalia and the responsiveness of the isolated vas deferens of the adult rat to acetylcholine (ACh). acetyl-L3-methylcholine (MECh), adrenaline (A), noradrenaline (NA), and barium chloride (BaCl2). No spontaneous contractions were observed throughout the experiments. In addition to a drastic inhibition of accessory genitalia development and an increase in adrenal gland weight, castration of neonates induced the appearance of supersensitivity of the isolated vas deferens to BaCl2 (all groups), ACh (all groups except Day 5), and MECh (Days 1 and 15) allied to subsensitivity to A (Days 1 and 15)