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A benign method for maintaining ovulatory estrogen levels in cycling rhesus macaques
Authors:Fred B Bercovitch  Robert W Goy  Guenther Scheffler  Daniel J Wittwer  Mike Hempel
Abstract:The goal of this study was to develop a relatively noninvasive technique for generating ovulatory estrogen levels in cycling females over extended periods of time. Eleven intact cycling rhesus macaques were given weekly injections of estradiol cypionate in an effort to obtain weekly levels which approximated ovulatory levels. A dose of 500 μg generated weekly estrogen values averaging 370 ± 18 pg/ml. This method is a satisfactory alternative to more traditional techniques. It involves no surgical procedures, it is relatively nonintrusive, it does not terminate a female's reproductive career, and it is not as time-consuming as daily injections. Female cycle state can be altered with a minimum of manipulation for studies involving the behavior of estrous females.
Keywords:females  estradiol cypionate  Macaca mulatta
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