The aim of this study was to investigation on effects of dietary supplemented semi-refined sunflower oil with vitamin E (as anti-oxidant agent) on egg production performance in laying hens. This study was conducted as 3×2 factorial experiment with three levels (2, 4 and 6 percents semi-refined sunflower oil) and two vitamin E levels (75 and 150 mg/kg) in six treatments (include three replicates and 12 bird in each replicate) in completely randomized design. In this experiment 212 laying hens Hy-line (W36) strain were evaluated from 62 to 74 weeks. Maximum of egg production percent (67.27), egg mass (40.89g) and of the best feed conversion ratio (FCR: 2.47) were observed in groups fed 6% semi-refined sunflower oil supplemented ration. Supplementation of 150mg/kg vitamin E caused the highest egg production (64.15%). As interactive effects; maximum amounts of egg production (73.82%), egg mass (44.68g) and the best FCR (2.25) were resulted by 6% semi-refined oil and 150mg/kg vitamin E. It is concluded that dietary supplementation of 6% semi-refined sunflower oil in combination with 150 mg/kg vitamin E is an efficient choice for optimizing egg production performance.
