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Ovarian and pituitary function in dogs after hysterectomy
B Hoffmann1, R Höveler, S H Hasan
1Ambulatorische und Geburtshilfliche Veterinärklinik Justus-Liebig-Universität Giessen, Germany.
Journal of Reproduction and Fertility
|November 1, 1992
Summary
Hysterectomy in dogs shortened the time between heat cycles. While hormones remained similar, a drop in progesterone after surgery led to pseudopregnancy, suggesting the uterus influences anoestrous duration.
Area of Science:
- Reproductive Endocrinology
- Veterinary Gynecology
Background:
- The role of the uterus in regulating the canine oestrous cycle and associated hormonal fluctuations is not fully understood.
- Investigating the impact of hysterectomy on reproductive intervals and hormonal profiles provides insight into uterine function.
Purpose of the Study:
- To determine the effect of hysterectomy on the anoestrous interval in dogs.
- To analyze hormonal changes (progesterone, oestradiol, prolactin, growth hormone) following hysterectomy.
- To investigate the potential role of the uterus in canine pseudopregnancy and anoestrus duration.
Main Methods:
- Comparison of anoestrous intervals between five hysterectomized dogs and five control dogs.
- Monitoring of serum hormone concentrations (progesterone, oestradiol, prolactin, growth hormone) in both groups.
- Observation of clinical signs of pseudopregnancy.
Main Results:
- Hysterectomy significantly shortened the anoestrous interval (96.6 days) compared to controls (149.4 days).
- No significant differences in overall hormone concentrations were observed between groups.
- A transient fall in progesterone levels post-surgery correlated with the development of pseudopregnancy symptoms.
Conclusions:
- Canine luteal regression occurs independently of a uterine luteolysin.
- The uterus appears to play a role in regulating the duration of the anoestrous period.
- A decline in progesterone concentrations, rather than other hormonal shifts, seems to initiate pseudopregnancy.