Author/Authors :
Mohammadi Gheisar، M نويسنده Department of Animal Science, Faculty of Agriculture, Islamic Azad University, Saveh Branch, Saveh, Iran Mohammadi Gheisar, M , Foroudi، F نويسنده Department of Animal Science, Faculty of Agriculture, Islamic Azad University, Varamin and Pishva Branch, Varamin, Iran Foroudi, F , Ghazikhani Shad، A نويسنده Department of Animal Science, Faculty of Agriculture, Islamic Azad University, Varamin and Pishva Branch, Varamin, Iran Ghazikhani Shad, A
Abstract :
This experiment was conducted to determine the effect of using L-threonine and reducing dietary levels of crude protein (CP) on egg production criteria in layers. Three hundred of Hy-Line W36 laying hens were used in this experiment. This experiment consisted of three experimental treatments with five replications in each. Experimental treatments included 3 diets with different levels of CP which were 15, 16 and 17% with 0.1, 0.05 and 0.02% L-threonine supplementation, respectively. Experimental period lasted for 5 weeks. In this experiment quantitative factors such as egg mass, egg weight, egg production percentage, feed conver-sion ratio (FCR), body weight and feed intake were measured. Measured data were analyzed by completely randomized design (CRD). Results indicated that reducing dietary levels of CP to 15% and using L-threonine supplementation had no significant effect (P > 0.05) on laying criteria. According to economic analysis, the treatment containing 15% CP and 0.1% L-threonine was the most beneficial treatment.
