Study of immune system following use of different expression methods of energy and amino acids requirements in Arian broilers

Despite the fact that immune responses, influenced by dietary nutrients but feed formulation is mainly based on the productive responses, so the immunity indexes were ignored.
This was carpeted out study to determine the effects of diets formulation based on different expression systems of energy and amino acids of feeds and requirements on performance and immune responses of Arian chicks.
A total of 1440 Arian chicks were fed Eight diets that arranged in a 2×2×2 factorial design with 2 systems of energy expression (AMEn and TMEn), 2 methods of amino acids content of feeds (TAAF and DAAF) and 2 methods of amino acids requirement (TAAR and DAAR) from 1 to 42 days of age. Each treatment was replicated six times with each replicate consisting of 15 males and 15 females.
The results showed that when the Feed formulation was based on TMEn and DAA, the productive parameters increased compared with AMEn and TAA (p Selection for increase the growth rate in poultry, improve metabolic and physiological processes in order to the use of the feed. Therefore lower proportions of nutrients will be allocated to other vital systems. However the most suitable of immune responses were belonging to treatments were fed diets which were set based on AMEn and received high level of amino acids. There is a negative correlation between immune responses and productive parameters. It is recommended that in normal conditions use of TMEn and DAA system and in stress conditions of AMEn and DAAF×TAAR to feed formulation.