EFFECT OF SOME AMINO ACIDS SUPPLEMENTATION IN DIET ON PRODUCTIVE PERFORMANCE OF BROILER CHICKS UNDEREGYPTIAN SUMMER CONDITIONS

Abstract

The present study was carried out in Poultry Nutrition Farm, Poultry Production Department, Faculty of Agriculture, Ain Shams University, Shoubra El-kheima, Egypt. The objective was to evaluate the effect of supplementing different levels of threonine and tryptophan on growth performance, carcass traits and some plasma parameters of broiler chicks under Egyptian summer conditions. All farm work during the experimental period from August to September 2017. A total of 360, Ross 308, one-day-old broiler chicks were randomly allocated into 9 treatments with 8 replicates of 5 chicks each. Three levels of threonine (100, 150 or 200 %) and three levels of tryptophan (100, 150 or 200%) according to dietary requirements for Ross 308 chick's guidebook were used in a factorial design arrangement to obtain nine experimental treatments. Two periodical diets (A corn-soybean basal diets) were used (starter phase 1-21 days of age and grower phase 22-35 days of age). Growth performance traits including live body weight (LBW), Body weight gain (BWG), feed consumption (FC) and feed conversion ratio (FCR) were recorded at the end of each week. Carcasses were manually eviscerated and weighed. Components of total protein, albumin, cholesterol, and triglycerides were analyzed by using commercial kits. The main results could be summarized as follows: 1- Chicks fed diet supplementing 200 % threonine had an improvement in live body weight and body weight gain with different levels of tryptophan compared to other treatments. 2- The highest LBW was recorded by chicks fed diet supplemented with 150 % of chicks' requirements of both types' amino acids and the lowest was recorded by chicks fed diet supplemented with