Effect of overpopulation on spermatogenesis in pigeon.
D000818:Animals; D001522:Behavior, Animal; D001835:Body Weight; D002452:Cell Count; D002467:Cell Nucleus; D010856:Columbidae; D003441:Crowding; D007985:Leydig Cells / Q000166:cytology; D008297:Male; D013087:Spermatids; D013091:Spermatogenesis; D013093:Spermatogonia; D013737:Testis / Q000166:cytology / Q000502:physiology