Level of which hormone decreases in blood when both ovaries are removed from a female?
Oestrogen
The hormone decreased in blood when both ovaries are removed from a female is Oestrogen. Ovary secretes two hormones. Oestrogen before ovulation and progesterone after ovulation. Oxytocin, Prolactin are Pituitary hormones and gonadotropin releasing factor is secreted by hypothalamus of brain to stimulate pituitary for the secretion of Gonadotropic hormones.