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The prolific Romanov (R, ovulation rate = 3) and non-prolific Ile-de-France (IF, ovulation rate = 1) breeds were compared for their ovarian sensitivity to gonadotropins and IGF-I before puberty. For this purpose, the effects of in vivo immunization against GnRH on populations of ovarian follicles and in vitro sensitivity of granulosa cells to FSH and IGF-I were studied in prepuberal lambs from both...
Oocytes from prepubertal calves have been shown to be less developmentally competent than their adult counterparts and FSH stimulation prior to oocyte collection does not affect this competence (Revel et al., 1995, J Reprod Fertil, 103:115-120). This absence of effect of FSH treatment on oocyte quality may be due to the heterogeneity of recruited follicles. GnRH agonists have been shown to depress...
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