Hypothalamo-Hypophyseal System nonhuman 24 rat 20 Male 18 Pituitary-Adrenal System 18 Rats 18 animal experiment 18 Animal 16 Animals 16 Female 16 female 14 priority journal 14 Humans 12 Support, Non-U.S. Gov't 12 article 12 hypothalamus hypophysis system 12 endocrine system 10 hypothalamus hypophysis adrenal system 10 luteinizing hormone 10 male 10 metabolism 10 physiology 10 Pituitary Gland, Anterior 8 Testis 8 animal 8 controlled study 8 estrogen 8 gonadorelin 8 hormonal regulation 8 human 8