[Analysis of several years of breeding hygiene work in swine]

An analysis of disturbances in sow fertility in breeding units in regard to the clinical appearance, the cause and pathology as well as the possibilities of prophylaxis, was conducted. The important reductions or disturbances in fertility are: --An- and subestrous of gilts --disturbances in ovulation, silent estrous as well as prolonged resting phases of old sows --cyst development and subsequent anestrous of old sows --persisting lactation anestrous. The main source of disturbance in the fertility of the sows was found to be the nutrition not adequately adapted to physiological needs especially in advanced pregnancy and other stress situations. The correction of the mentioned causes through management is the most important measure in prophylaxis.