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30 days 46 days administration age groups animals ovulating blood sample bw EB days of age Dierschke Donovan dose e_t al_ EB injection EB-induced LH surge effects of EB effects of estrogen Endocrinol Endocrinology estradiol estrogen estrous cycle female guinea pigs female rat gonadal gonadotropin release gonadotropin secretion Grumbach hypothalamic immature animals immature guinea pigs increase intact animals Knobil LH levels LH release LH secretion LH-RH injection LH-RH release lordosis behavior luteinizing hormone menarche negative feedback system neuroendocrine ng/ml number of animals number of C.L. observed onset of puberty opening and ovulation ovarian steroids ovariectomy ovaries OVX animals OVX at l0 OVX guinea pigs pattern of LH pentobarbital peri period peripubertal group pituitary responsiveness plasma LH concentrations plasma LH values positive feedback response positive feedback system precocious puberty prepubertal present study prior progesterone release of LH rhesus monkey sexual maturation species Terasawa et al_ tropins vaginal opening