title: Ovarian and pituitary function in dogs after hysterectomy.
abstract: In studies of five hysterectomized and five control dogs, hysterectomy shortened the anoestrous interval (96.6 +/- 28.0 versus 149.4 +/- 50.9 days, P < 0.05). No differences in hormone concentrations (progesterone, oestradiol, prolactin and growth hormone) were observed between the control and hysterectomized dogs except for a brief fall in progesterone concentrations over 8 days immediately after surgery, between days 35 and 40 after onset of pro-oestrous bleeding; only these animals developed symptoms of overt pseudopregnancy. It is concluded that, in dogs, luteal regression occurs independently of a uterine luteolysin, but that the uterus may play a role in control of duration of anoestrus. Pseudopregnancy seems to be initiated by a fall in progesterone concentrations rather than by other hormonal changes.
authors.affiliation: Ambulatorische und Geburtshilfliche Veterinärklinik Justus-Liebig-Universität Giessen, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Hoffmann
authors.forename: R
authors.initials: R
authors.lastname: Höveler
authors.forename: S H
authors.initials: SH
authors.lastname: Hasan
authors.forename: K
authors.initials: K
authors.lastname: Failing
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D004285:Dogs / Q000502:physiology* / Q000601:surgery; D004958:Estradiol / Q000097:blood; D004971:Estrus / Q000502:physiology*; D005260:Female; D013006:Growth Hormone / Q000097:blood; D007044:Hysterectomy / Q000662:veterinary*; D008137:Longitudinal Studies; D003341:Luteolysis / Q000502:physiology; D010053:Ovary / Q000378:metabolism*; D010902:Pituitary Gland / Q000378:metabolism*; D011374:Progesterone / Q000097:blood; D011388:Prolactin / Q000097:blood
chemical_list: D011374:Progesterone; D004958:Estradiol; D011388:Prolactin; D013006:Growth Hormone