Abstract
The common techniques of enriching egg with vitamins and minerals by using large amount of them in the feed become very usefull procedure for producing designer eggs. Enriching egg yolk with vitamin E, in egg producing industry, is very popular because of its antioxidative characteristics in humans. But, there is not much investigations for transfering of vitamin E in egg yolk during the second laying cycle of production using old (80 weeks) molted layers. These investigations were important for egg producing farms because of importance of keeping egg quality and improving functional characteristics of them. For this purpose the basic feed with 30 mg of vitamin E/kg and 0.3 mg selenium/kg was used as a control group. The hens from the experimental groups were feed with higher content of vitamin E in two combinations: 1. - 100 mg vitamin E/kg feed and selenium content of 0.3, 0.38 and 0.46 mg/kg and 2. - 230 mg vitamin E/kg feed and selenium content of 0.3, 0.38 and 0.46 mg/kg.Vitamin E concentration in the yolk was increasing linnearly from 1.62 mg/yolk in the control group, on 2.90 mg/yolk in experimental group of hens where the content of vitamin E was enriched to 100 mg vitamin E/kg feed and on 5.58 mg vitamin E/yolk when the amount of vitamin E in feed was increased to 230 mg/kg. The higher content of vitamin E in hen's feed show trend of increasing the egg production and intensity of laying. The similar trend was noticed with increasing of selenium in the feed also.
