Effect of dietary energy and total sulfur amino acid level’s on the productive performance of laying hens

A 3 X 3 factorial experimental design which contain 3 dietary energy levels (2750 , 2850 and 2950 Kcal ME/Kg) and 3 dietary total sulfur amino acids level [TSAA] (0.67 , 0.72 and 0.77%) was conducted to evaluate the effect of dietary energy and TSAA levels on production performance, egg quality and economical feed efficiency of Lohman light laying hens.In this experiment, a total of180 Lohman light laying hens in first phase of production cycle (20 wk of age) were randomly assigned into 9 treatments (5 replicates of 4 birds/ treatment), the experiment lasted 20 week.The obtained results showed that when dietary energy increased from 2750 to 2950 Kcal ME/Kg, hens adjusted feed intake from 96.7 to 90.40 g/hen/day to achieve a constant energy intake so that the same amount of dietary energy (4.9Kcal) was used to produce 1 g of egg. Increasing dietary energy significantly (P  0.05) increased egg weight, egg mass, shell thickness and significantly improved feed conversion and decreased Haugh unit. Increasing dietary TSAA from 0.67 to 0.77% significantly improved feed intake, egg production, egg weight, egg mass, feed conversion, but had no effect on egg quality traits. The maximum profits were obtained lay feeding hens diets containing 2950 Kcal ME/Kg and 0.72% TSAA. from nutritional and economical point of view, it could be concluded that Lohman light laying hens required 2950 Kcal ME/Kg and 0.72% TSAA in the diet or 267.33 Kcal ME/Kg and 652.46 mg TSAA per hen daily from 21 to 40 wk of age under Egyptian conditions.