Reinforcement of Low-Protein Diets with some Essential Amino Acids and Their Effect on the Characteristics of a Carcass and some Blood Characteristics of Broilers

Abstract

AbstractThe experiment was conducted in the poultry field of the Department of Animal Production - College of Agriculture - Tikrit University for the period from 18-25/10/2021, as the purpose of it was to strengthen low-protein diets with some essential amino acids (AA) and their effect on productive performance and some physiological characteristics of broilers. In this experiment, (300) ROSS 308 birds were bred with an average initial weight of 39.7 g. The birds were divided into five treatments, each treatment consisted of three replicates and was distributed in cages (20 birds per cage), the treatments were randomly distributed, (T1) the first treatment was treated The comparison contains protein according to the ROSS guide 308, and (T2) the second treatment in which the protein was reduced by 5% and fortified with essential AA (lysine, methionine, and threonine), and (T3) the third treatment in which the protein was reduced by 10% and was fortified with AA (Lysine, methionine, and threonine), and (T4) the fourth treatment, in which the protein was reduced by 15% and fortified with AA (Lysine, methionine, and threonine), and (T5) the fifth treatment, which reduced the protein by 20% less than the recommendations of the NRC ( 1994) and fortified with AA (lysine, methionine, and threonine). The results of this experiment showed that there were no significant differences between the experimental treatments in the clearance ratio for both males and females, while there were significant differences at a significant level (P<0.05) in both the first treatment and the fifth treatment in the characteristic of the relative weight of the liver for males higher than The rest of experimentalist treatments, whereas the 4th and 5th treatments were higher levels than the rest of experimentalist treatments in the characteristic of the relative weight of the heart of males, while there were no significant differences in each of (gizzard, spleen and belly fat) for male broilers, while the fourth treatment (T4) outperformed the third treatment. In the characteristic of the relative weight of the gizzard in female broilers, the significance of the fourth treatment and the rest of the experiment treated not differ in the same characteristic, while there were no significant differences at a significant level (P<0.05) in (liver, heart, spleen, and belly fat) in the Female broilers. As for the biochemical characteristics of male and female broilers, additionality treatments were superior in some of them, and there were no statistically significant differences in some others