Effect of Protein Concentrate Withdrawal and Reducing the Crude Protein in Diets and Supporting Them with a Mixtures of Essential Amino Acids on some Physiological Traits of Laying Hens

Abstract

The study was conducted to show Effect of protein concentrate Withdrawal and reducing the crude Protein in diets and supporting them with a mixtures of essential amino acids on some physiological traits of laying hens. (128) laying hens, type Lohmann Brown, at the age of (21) weeks, was randomly distributed among 8 treatments, with 8 replications for each treatment, as each replication was carried out on (2) hen (16 chickens/treatment), And the experimental treatments were as follows: T1 control (standard diet) and T2 (a treatment devoid of protein concentration ), and treatments T3, T4, and T5 (in which the percentage of crude protein was reduced by 1% and add on a mixture of amino acids consisting of methionine, lysine, and threonine was added by 1, 1.5, and 2%, respectively), and treatments T6, T7, and T8 (in which the percentage of crude protein was reduced by 2%, and add on a mixture of amino acids consisting of methionine, lysine, and threonine was added by 1, 1.5, and 2%, respectively). The results showed that there were no significant differences between the treatments of the experiment, but it was noted that there was a significant superiority (P < 0.05) for the treatments of adding the mixture of amino acids in favor of the treatments T1 and T10 in terms of cholesterol, total protein and albumin, compared with the treatment of T1 and T2 control, as well as treatment recorded T1, T2 and T3 Highly significant (P<0.01) superiority in IgM and IgA traits. It can be concluded from this study that adding the mixture of amino acids by 1.5 and 2% and reducing the protein percentage by (1 and 2%) led to a significant improvement in some physiological characteristics compared with the control treatment