however , since the oestradiol antibody titres in the testosterone-immunized and oestrone-immunized ewes were considerably lower than those found in the oestradiol-immunized animals , it is possible that testosterone and oestrone , perhaps by acting as prehormones , could influence the negative feedback control by oestradiol-17 beta of gonadotrophin secretion in the anoestrous ewe .
C0717756
oestradiol
C0039601
testosterone