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THE EFFECT OF UNILATERAL ORCHIDECTOMY AND UNILATERAL CRYPTORCHIDISM ON SPERM OUTPUT IN THE RAT

Removal or damage to one of a pair of glandular organs frequently results in compensatory hypertrophy, compensatory hyperplasia, or both, of the cells of the remaining or intact gland. In the rat, after unilateral orchidectomy, hypertrophy of the germ cells of the remaining testis has been reported, followed by an increase in testis volume (Grant, 1957). Unilateral artificial cryptorchidism is accompanied by hypertrophy, but not by hyperplasia, of the germ cells in the remaining scrotal testis. Some authors have noticed a significant increase in the weight of the scrotal testis (Zimel, Rivenzon & Macrineanu, 1962) while others have denied this (Clegg, 1965). Nothing is known about the sperm output after unilateral orchidectomy or cryptorchidism. In the following experiments, the output of spermatozoa after unilateral orchidectomy and unilateral cryptorchidism was determined by