title: Circadian rhythms and photoperiodic time measurement in birds.
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002940:Circadian Rhythm; D005640:Follicle Stimulating Hormone / Q000378:metabolism; D006128:Growth; D008027:Light; D007986:Luteinizing Hormone / Q000378:metabolism; D008297:Male; D008954:Models, Biological; D010507:Periodicity; D011784:Quail; D012098:Reproduction; D013737:Testis / Q000254:growth & development
chemical_list: D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone