title: Photoperiodic control of testis activity in the vole, Microtus agrestis.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D008027:Light; D008297:Male; D009929:Organ Size; D010507:Periodicity; D012377:Rodentia / Q000502:physiology*; D012621:Seasons; D012669:Seminal Vesicles / Q000033:anatomy & histology / Q000254:growth & development; D013091:Spermatogenesis; D013737:Testis / Q000033:anatomy & histology / Q000166:cytology / Q000254:growth & development / Q000502:physiology*