Roughly fifteen days before fertilization can happen, the anterior pituitary gland secretes follicle stimulating hormone, FSH, which ripens a handful of follicles of the ovary that then release estrogen.

在受精发生前大约 15 天，垂体前叶分泌促卵泡激素 FSH，使少量卵巢卵泡成熟，然后释放雌激素。