Document Type : Research Paper
Authors
1 Faculty of Agriculture, University of Razi
2 Ph.D., Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
Abstract
The experiment was conducted to investigate the effect of diets supplemented with crystalline amino acids on the relative economic benefit in the production performance of broiler chickens. For this purpose, 576 Ross 308 broiler chickens (mixed sexes) were used in a 4x2 factorial experiment with two experimental diets (high and low protein quality) and four levels of crystalline amino acids (recommended levels), without supplemented crystalline amino acids (levels 10 and 15 percent above the required level). A completely randomized design with eight treatments, six replications, and 12 chickens per replication was conducted. The results of this study showed that adding crystalline amino acids at levels 10 and 15 percent above the required level (recommended) to diets containing rapeseed and wheat meal (low quality protein source) increased performance (P<0.0001). According to the results of this study, the use of crystalline amino acids at levels higher than the bird's requirement, especially in high quality diets such as (soybean meal and corn), had no effect on the performance of broiler chickens and was not recommended. Also, in terms of relative economic profitability, the highest feed cost, feed cost per live body weight, and gross profit were related to experimental treatments supplemented with crystalline amino acids.
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