title: Electroejaculation and semen characteristics of Asiatic black bears (Ursus thibetanus).
abstract: This study details the seminal traits in the rare Asiatic black bear, revealing that this species generally produces high quality, concentrated ejaculates containing sperm of high motility and morphological integrity and similar to other members of the Ursine lineage. Semen was collected by electroejaculation and 23 trials were performed on 18 bears. The mean values were obtained for volume (0.61 ml), pH (7.1), sperm concentration (1049 x 10(6) ml(-1)), total sperm counts (502.8 x 10(6)), motility percentage (63.8%), forward progressive status (3.5), abnormal sperm percentage (37.9%) and intact acrosome percentage (76.6%).
authors.affiliation: State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, PR China.
authors.forename: L M
authors.initials: LM
authors.lastname: Chen
authors.forename: R
authors.initials: R
authors.lastname: Hou
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhang
authors.forename: J S
authors.initials: JS
authors.lastname: Wang
authors.forename: X R
authors.initials: XR
authors.lastname: An
authors.forename: Y F
authors.initials: YF
authors.lastname: Chen
authors.forename: H P
authors.initials: HP
authors.lastname: Zheng
authors.forename: G L
authors.initials: GL
authors.lastname: Xia
authors.forename: M J
authors.initials: MJ
authors.lastname: Zhang
mesh_terms: D000375:Aging; D000818:Animals; D000836:Animals, Zoo; D004542:Ejaculation / Q000502:physiology*; D004558:Electric Stimulation; D008297:Male; D012661:Semen / Q000502:physiology*; D013094:Spermatozoa / Q000166:cytology / Q000502:physiology; D001503:Ursidae / Q000502:physiology*