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Effects of estrogen administration on parathyroid function in cattle
National Institute of Animal Health Quarterly
|January 1, 1980
Summary
Estrogen administration in bullocks reduced appetite and improved parathyroid gland function, enhancing calcium recovery. This suggests estrogen influences calcium metabolism through bone resorption and parathyroid hormone secretion.
Area of Science:
- Veterinary Endocrinology
- Calcium Metabolism
Background:
- Estrogens play a role in calcium homeostasis.
- The effects of exogenous estrogens on parathyroid function and calcium metabolism in cattle require further elucidation.
Purpose of the Study:
- To investigate the impact of estrogen administration on appetite, parathyroid gland function, and calcium metabolism in castrated bullocks.
Main Methods:
- Six castrated Holstein bullocks were divided into experimental (estrogen-treated) and control groups.
- The experimental group received intramuscular injections of estrone and estradiol-17 beta daily for 7 days.
- Parathyroid gland function was assessed using ethylenediaminetetra-acetic acid 2Na infusion, and plasma calcium levels were monitored.
Main Results:
- Estrogen treatment led to a noticeable decrease in appetite.
- The secretory function of the parathyroid gland improved in the estrogen-treated group.
- Enhanced recovery of plasma-titratable calcium was observed post-infusion in the experimental group.
Conclusions:
- Estrogen administration in bullocks influences appetite and calcium metabolism.
- The observed changes in calcium metabolism are likely mediated by accelerated bone resorption, stimulated by increased parathyroid hormone secretion due to estrogen exposure.