Fertility problems in mares

In spring, many horse owners and breeders are faced with the problem that their mare fails to conceive or resorbs early.

There are a number of possible reasons for a mare not becoming pregnant. However, in most cases endometritis is responsible for unsuccessful breeding. This acute or chronic inflammation of the lining of the uterus is usually associated with fluid accumulation. In conventional medicine this problem is treated with flushing to remove debris, followed by use of antibiotics. However this merely reduces the symptoms without addressing the cause. It cannot repair the damage to the endometrium, the immune system remains suppressed, so that frequently pathogenic organisms can spread again and cause further damage to the uterine lining. In these mares the self-cleansing mechanism of the uterus (uterine clearance) is impaired.


Nutriology means nutritional therapy and is a holistic medical approach. Many illnesses today result from wrong nutrition. Therefore, nutriology tries to biologically regulate the metabolic processes of the body and thus to activate the self-healing processes.

Mares which develop inflammatory processes in the uterus after mating also have impaired uterine clearance. In this case we speak of post-breeding induced endometritis (PBIE). Diseases of the uterus need not always be of infectious origin, chronic degenerative changes of the endometrium (endometriosis or chronic degenerative endometritis) can also compromise a mare’s fertility. In these cases increasing fibrous tissue develops in the endometrium, which reduces its ability to contract and impairs the functioning of the uterus. The condition usually occurs in older mares. A tissue biopsy can show to what extent these changes are present in the uterus.

More about permanent oestrus >