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The Causes of Bovine Metestrous Bleeding

Cornell University¹

Abstract

1. Overt uterine bleeding follows if ovariectomy is performed during or one day after heat; not if the operation is performed at any other stage in the cycle.
   
2. Injections into ovariectomized cows of a variety of hormones, given in various combinations and dosages rarely cause overt bleeding.
   
3. The evidence favors the view that normal metestrous bleeding in the cow is due to estrogen withdrawal, although the cessation of estrogen injections does not cause overt bleeding in ovariectomized cows.
   
4. Microscopic bleeding in the ovariectomized cow occurs sometimes during estrogen injections. Then there is a latent period of about ten days after which they may bleed again.
   
5. With progesterone injections all cows showed microscopic bleeding.
   
6. Microscopic bleeding in the normal cow is probably due to progesterone and its occurrence at about ten days postestrum is probably due to the action of the latent period.
   
7. Prostigmine injections into normal cows are not followed by bleeding.
   

¹ Department of Animal Husbandry, New York State College of Agriculture, Ithaca, New York.