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Abstract
As Thai Monocled Cobra is at high risk of various causes, especially human hunting and
become threatened with extinction. Therefore, The Queen Saovabha Memorial Institute (QSMI),
Thailand, initiated a captive breeding program to supply healthy snakes for venom and antivenom
production. However, to be successful in their propagation, the reproductive biology of Thai
Monocled Cobra maintained in captivity is basically required, especially, monthly sex hormonal
profiles of female estradiol and male total testosterone. All of the samples were collected at the
Queen Saovabha Memorial Institute. It was found that female estradiol concentration was surged
during October-November while as male total testosterone level was peaked during August-
September, one to two months prior to male maximal levels. It suggests that its breeding season
probably occurred at during August-November. However, unfortunately, there is no wild Thai Monocled
Cobra available to us to compare seasonal profiles of sex hormones with those raised in captivity.
Keywords :
Thai Monocled Cobra; Naja kaouthia; Estradiol; Total testosterone
