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J Reprod Fertil. 1992 Nov;96(2):837-45.

Ovarian and pituitary function in dogs after hysterectomy.

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Ambulatorische und Geburtshilfliche Veterinärklinik Justus-Liebig-Universität Giessen, Germany.


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.

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