title: Seasonal influence on testicular function of male raccoons, Procyon lotor.
abstract: In order to clarify the breeding capability of male raccoons in Japan, the testes of raccoons, a nuisance animal, collected in Kanagawa Prefecture and Hokkaido were histologically inspected. Furthermore, testosterone concentrations in their blood were measured. The testosterone concentrations increased in winter and the diameter of seminiferous tubules and the spermatogenetic score decreased in summer for the animals captured in Kanagawa Prefecture. For the animals captured in Hokkaido, the diameter of seminiferous tubules did not change and the decrease of the spermatogenetic score in summer was slight. As the above results show, there is a breeding season in male raccoons in Japan, and the reduction of testicular function in summer was greater in animals captured in Kanagawa Prefecture than in animals captured in Hokkaido.
authors.affiliation: Department of Veterinary Obstetrics and Gynecology, School of Veterinary Medicine, Azabu University, Kanagawa, Japan. kaneko@azabu-u.ac.jp
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Kaneko
authors.forename: Yuumi
authors.initials: Y
authors.lastname: Akiya
authors.forename: Haruno
authors.initials: H
authors.lastname: Sato
authors.forename: Ayako
authors.initials: A
authors.lastname: Tanaka
authors.forename: Hajime
authors.initials: H
authors.lastname: Aoki
authors.forename: Masakazu
authors.initials: M
authors.lastname: Miyoshi
authors.forename: Takahide
authors.initials: T
authors.lastname: Abukawa
authors.forename: Makoto
authors.initials: M
authors.lastname: Mochizuki
authors.forename: Shizuo
authors.initials: S
authors.lastname: Kawakami
mesh_terms: D000818:Animals; D007150:Immunohistochemistry; D008297:Male; D011821:Raccoons; D011863:Radioimmunoassay; D012621:Seasons; D012671:Seminiferous Tubules / Q000033:anatomy & histology; D013091:Spermatogenesis; D013737:Testis / Q000033:anatomy & histology* / Q000502:physiology; D013739:Testosterone / Q000378:metabolism
chemical_list: D013739:Testosterone