title: Relationships among age, body weight, scrotal circumference, semen quality and peripheral testosterone and estradiol concentrations in pubertal and postpubertal Holstein bulls.
abstract: In the present study, the correlations among age, body weight, scrotal circumference (SC), semen quality and peripheral testosterone and estradiol-17beta (E(2)) concentrations were investigated in pubertal (n=5) and postpubertal (n=7) groups of Holstein bulls over a 6 week period. There were significant positive correlations (P<0.01) among age, body weight and SC in both groups, and similar significant correlations between sperm motility and SC in pubertal bulls (P<0.01) and between sperm concentration and SC in postpubertal bulls (P<0.05). The sperm motility after collection (P<0.05) and after freezing and thawing (P<0.01) of the postpubertal bulls correlated positively with the E(2) concentration. Estrogen may be important for the function of postpubertal bull testes, in which it may regulate spermatozoa motility in vivo.
authors.affiliation: The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan.
authors.forename: Bhuminand
authors.initials: B
authors.lastname: Devkota
authors.forename: Tsugio
authors.initials: T
authors.lastname: Koseki
authors.forename: Motozumi
authors.initials: M
authors.lastname: Matsui
authors.forename: Motoki
authors.initials: M
authors.lastname: Sasaki
authors.forename: Etsushi
authors.initials: E
authors.lastname: Kaneko
authors.forename: Akio
authors.initials: A
authors.lastname: Miyamoto
authors.forename: Carlos
authors.initials: C
authors.lastname: Amaya Montoya
authors.forename: Yoh-Ichi
authors.initials: Y
authors.lastname: Miyake
mesh_terms: D000375:Aging; D000818:Animals; D001835:Body Weight / Q000502:physiology; D002417:Cattle / Q000502:physiology*; D004958:Estradiol / Q000097:blood*; D008297:Male; D012611:Scrotum / Q000033:anatomy & histology*; D012661:Semen / Q000502:physiology*; D012741:Sexual Maturation / Q000502:physiology*; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D004958:Estradiol