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Journal of Reproduction and Fertility (1972) 29 99-103
DOI: 10.1530/jrf.0.0290099
Copyright © 1972 Society for Reproduction and Fertility
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PLASMA TESTOSTERONE LEVELS IN RELATION TO MUSTH AND SEXUAL ACTIVITY IN THE MALE ASIATIC ELEPHANT, ELEPHAS MAXIMUS

M. R. JAINUDEEN, C. B. KATONGOLE and R. V. SHORT

Summary.: Testosterone was measured in the peripheral blood plasma of eleven male Asiatic elephants, using a competitive protein-binding assay. When the animals showed no signs of musth, the testosterone levels were low (<0·2 to 1·4 ng/ml) ; as they began to come into musth and the temporal glands started to enlarge, the testosterone levels rose (4·3 to 13·7 ng/ml), and when the animals were in full musth, with discharging temporal glands and an aggressive temperament, the levels were extremely high (29·6 to 65·4 ng/ml). Musth may therefore be comparable to the rutting behaviour of some seasonally breeding mammals, although, in the elephant, there is some indication that it may be induced by sexual activity.




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