EN
In young sows there have been assessed the influence of the change of some zoohygienic factors on weight gains and the clinical state in the perinatal period. In this aim young animale being at „meat point” were moved to the premises with boars, where a light day and night lasted at least for 10 hours and where the room of living increased from 0.8 to 1.6 m2, and feed CPT-II was replaced by PR. It was observed an increased number of heating sows and covered, a shortened time of pregnancy at 1.2 days, and a shortened time of parturition (at approximately 1 hour). The weight and number of piglets were also assessed at day 0, 10, 2il and 28. In all the mentioned times the values were better than those of controls. A lower morbity was also noted in the experimental group of sows and the course of the disease in this group of animals was milder.