Testes are asymmetric in the testicular hemicastration response of the male rat

in Journal of Endocrinology


An enquiry was made into variability in the testicular hemicastration response of the mature rat (doubling of testicular vein testosterone concentration from the remaining testis 24 h after hemicastration). The response was shown to be asymmetric, being more reliable and more robust when the left testis was removed first. Apparently the testicular hemicastration response, which has been shown to be neurally controlled, shares the asymmetry which has been reported recently in the neural regulation of unilateral ovariectomy.

Journal of Endocrinology (1989) 122, 485–488


An official journal of

Society for Endocrinology



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