title: A seasonal influence on testes weight and serum gonadotropin levels of the mature male laboratory rat.
mesh_terms: D000367:Age Factors; D000818:Animals; D000830:Animals, Laboratory / Q000502:physiology*; D001835:Body Weight; D005640:Follicle Stimulating Hormone / Q000097:blood; D006065:Gonadotropins, Pituitary / Q000097:blood*; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D009929:Organ Size; D011388:Prolactin / Q000097:blood; D011467:Prostate / Q000033:anatomy & histology; D051381:Rats; D012621:Seasons; D013737:Testis / Q000033:anatomy & histology*; D013739:Testosterone / Q000097:blood
chemical_list: D006065:Gonadotropins, Pituitary; D013739:Testosterone; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone