title: The effect of duration of the daily photoperiod on recovery of photosensitivity in photorefractory canaries (Serinus canarius).
mesh_terms: D000818:Animals; D002171:Canaries / Q000502:physiology*; D008027:Light; D008297:Male; D010507:Periodicity; D013737:Testis / Q000033:anatomy & histology / Q000254:growth & development*; D013997:Time Factors