[Etiopathogenesis and prevention of encephalomalacia in chickens].

Studies were carried out on the dissemination of encephalomalation with chickens. The quality of the feeding-mixes, meant for the different categories of fowls, was also studied with regard to the contents of vitamins, fats, aldehyde and peroxide number and antioxidizers. The contents of vitamin E was also determined, as well as its biological activity in a biological material. The prophylactic effect of different vitamin preparations was tested in combination with other means of prophylaxis of broilers against encephalomalation. It was proved that the increase of aldehydes and peroxides in feeding-mixes could lead to the appearance of encephalomalation with chickens. The quantity of santokvin--200 g/t of fodder enabled the good conservation and preservation of the biological activity of vitamin E. The index 'biological activity' is a more appropriate criterium for a supply of chickens with vitamin E, rather than its quantitative contents in biological substrates. On the basis of the experiments made, a disgram is offered about the prophylaxis of encephalomalation with chickens.