Impact of Feed Low-Protein Diets During Starting Period of Diets Fortified with Amino Acids on Productive Performance and Blood Parameters of Broiler Chickens

Abstract

The purpose of this study was to examine how broilers' blood profiles and growth performance responded to dietary additional amino acid supplementation on a diet low in protein throughout the starter period. One hundred sixty 1-day-old, unsexed broiler chicks were divided into five groups at random, each with four replications and eight chicks per pen floor. The first group was fed a basal diet (the control group: T1), the second treatment was fed the basal diet (BD) after fasting for 24 h (T2), the third treatment was fed BD supplemented with high level of lysine 12.9 g/kg (T3), the fourth treatment was fed BD supplemented with lysine, methionine and threonine requirements of 13.7, 6.38 and 8.9 g/kg of diet, respectively (T4). The fifth treatment was fed BD supplemented with lysine, methionine, threonine, and valine requirements of 14.7, 6.8, 9.9, and 10.4 g/kg of diet, respectively (T5). Growth performance parameters and blood parameters were measured. ) there were significant differences in live body weight (LBW) and body weight gain (BWG) between the T1, T2 and the other treatments (T3, T4 and T5) which supplemented with amino acid and the highest LBW were observed in T5. there were no significant differences in the plasma levels of total protein, albumin, AST, uric acid, T3, T4, IgM and IgG between amino acidsupplemented group and the control. The present outcomes show that extra amino acid supplements to the lowprotein diet during the start period have improved chickens' performance.