title: Oxytocin, vasopressin, prostaglandin F(2alpha), luteinizing hormone, testosterone, estrone sulfate, and cortisol plasma concentrations after sexual stimulation in stallions.
abstract: This experiment was designed to determine the effects of sexual stimulation on plasma concentrations of oxytocin (OT), vasopressin (VP), 15-ketodihydro-PGF(2alpha) (PG-metabolite), luteinizing hormone (LH), testosterone (T), estrone sulfate (ES), and cortisol (C) in stallions. Semen samples were collected from 14 light horse stallions (Equus caballus) of proven fertility using a Missouri model artificial vagina. Blood samples were collected at 15, 12, 9, 6, and 3 min before estrous mare exposure, at erection, at ejaculation, and at 3, 6, and 9 min after ejaculation. Afterwards, blood sampling was performed every 10 min for the following 60 min. Sexual activity determined an increase in plasma concentrations of OT, VP, C, PG-metabolite, and ES and caused no changes in LH and T concentrations. The finding of a negative correlation between C and VP at erection, and between C and T before erection and at the time of erection, could be explained by a possible inhibitory role exerted by C in the mechanism of sexual arousal described for men.
authors.affiliation: Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milan, Italy. maria.veronesi@unimi.it
authors.forename: M C
authors.initials: MC
authors.lastname: Veronesi
authors.forename: U
authors.initials: U
authors.lastname: Tosi
authors.forename: M
authors.initials: M
authors.lastname: Villani
authors.forename: N
authors.initials: N
authors.lastname: Govoni
authors.forename: M
authors.initials: M
authors.lastname: Faustini
authors.forename: H
authors.initials: H
authors.lastname: Kindahl
authors.forename: A
authors.initials: A
authors.lastname: Madej
authors.forename: A
authors.initials: A
authors.lastname: Carluccio
mesh_terms: D000818:Animals; D001127:Arginine Vasopressin / Q000097:blood; D015237:Dinoprost / Q000031:analogs & derivatives / Q000097:blood; D004542:Ejaculation / Q000502:physiology*; D004970:Estrone / Q000031:analogs & derivatives / Q000097:blood; D006728:Hormones / Q000097:blood*; D006736:Horses / Q000097:blood / Q000502:physiology*; D006854:Hydrocortisone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010121:Oxytocin / Q000097:blood; D010410:Penile Erection / Q000502:physiology*; D012661:Semen / Q000502:physiology*; D012726:Sexual Behavior, Animal / Q000502:physiology; D013739:Testosterone / Q000097:blood
chemical_list: D006728:Hormones; D001127:Arginine Vasopressin; D004970:Estrone; C026528:15-ketoprostaglandin F2alpha; D013739:Testosterone; D010121:Oxytocin; D007986:Luteinizing Hormone; D015237:Dinoprost; C017296:estrone sulfate; D006854:Hydrocortisone