Fig. 1

The endocrine hormone levels of the female rats in an estrous cycle before administration, including proestrus (n = 24), estrus (n = 23), metaestrus (n = 29), and dioestrus (n = 84). The tested hormones are follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), estradiol (E2), adrenocorticotrophic hormone (ACTH), and prostaglandin (PG). Except that the unit of FSH is IU/L, the other hormones are pg/mL