The testis and body temperature of mature male rats and domestic fowl following cadmium (Cd) and/or zinc (Zn) injections, or cryptorchidism, were studied. In the rat, Cd initially caused an increased testicular temperature with the degree of increase dependent upon amount and route of the Cd injection. After the initial increase, which lasted for 50 to 120 min, there was a depression of temperature to below pre-injection levels, again dependent upon Cd level. Body temperature was unchanged with subcutaneous injections of Cd and dropped with intraperitoneal injections. Zinc caused body and testis temperatures to decline and pre-treatment with Zn prevented the increase in testicular temperature following injections of Cd. In the cryptorchid rat and in the fowl, testicular and body temperatures did not differ either before or after treatment. In the cryptorchid and castrated rat, body temperature appeared to decline more than in the rat with scrotal testes after Cd treatment, while in the chicken there was no change in either testis or body temperature.
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