The influence of different dietary threonine to digestible lysine ratios on laying hens feed intake and weight change in low protein diets at peak of egg production

دیندار, امین and جانمحمدی, حسین and علیایی, مجید and کیان فر, روح الله The influence of different dietary threonine to digestible lysine ratios on laying hens feed intake and weight change in low protein diets at peak of egg production. In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

Use low protein diets with precise supply of protein and amino acid requirements and determination accurate ratios of amino acids to lysine can improve production performance and economic benefits. The aim of this study was to investigate the effects of different ratios of L-threonine (Thr) digestible L- lysine (Dig L- lys) amino acid (0.65, 0.70, 0.75, 0.80 and 0.85) on feed intake and weight change of laying hens using a total of 240 hy – line W-80 laying hens at 44 weeks for 6 weeks, in a completely randomized design with 5 experimental diets and 6 replicates with 8 hens per each replicate in an commercial laying farm. Experimental diets were formulated to supply or exceed the nutritional recommendations of hy-line W-80 strain. Feed intake was recorded weekly and body weight change of hens were measured by the difference of body weight at beginning of experiment (50 wk) and end of experiment (44 wk). Data were analyzed by SAS 9.1 software and mean differences were tested by tukey and kramer method. The results of the experiment showed that different ratios of L- thr to dig L- lys had no significant effect on daily feed intake and body weight change (p> 0.05). the result suggest that low ratio of L- thr to dig L- lys had no negative effect on feed intake and body weight change of laying hens at peak of egg production.

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