THE EFFECT OF USING DIFFERENT LEVELS OF VITAMIN E ON THE PRODUCTIVE TRAITS OF BROILER CHICKENS

This study was conducted at the Poultry Research Station of the Livestock Research Department in the Agricultural Research Department. (126) One-day-old chicks were used in the study, with an average starting weight of 38 g from Ross 308 strain. The chicks were distributed randomly into 3 treatments, and each treatment contained three replicates. 14 chicks for each replicate, where the first treatment was control, and the chickens in the second and third treatments were given vitamin E at a level of 350 and 600 mg / kg feed, respectively, as the continuous lighting system was followed (24 hours / day) in the hall until the end of the experiment, which reached 42 days and the temperature was 35 m throughout the study. The results of the study showed a significant (P<0.01) superiority of the two vitamin E treatments (350 and 600 mg/kg feed) over the control treatment in each of live body weight, weight gain rate, relative growth rate, production index, economic indicator, and feed consumption rate. Significant in the mortality rate and a significant improvement in the feed conversion coefficient for the two experimental treatments compared with the control treatment.