Effect of protease supplementation in diet with different levels of protein and amino acids on performance, carcass characteristics, digestibility of nutrients and concentration of blood parameters in broiler chicks

Document Type : Research Paper

Authors

1 Department of Animal Science, College of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

2 Department of Animal Sciences, College of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Abstract

In this experiment 240 Ross 308 male broilers (from 1 to 24 days of age) were used in a randomized complete design with six treatments and 4 replicates and 10 chicks per replicate. Experimental diets included: Control diet based on corn and soybean meal, with recommended levels based on Ross strain guide, control diet with the addition of protease enzyme with recommended levels, Low protein diet, which has reduced about 5% of the protein level of the diet, Low protein diet with a decrease in the concentration of essential amino acids (about 5 percent), Low protein diet (Treatment 3) with addition of protease enzyme with recommended levels, Low protein diet with reduced essential amino acids by adding protease enzyme with recommended levels (0.02%).The highest amount of feed consumption in the initial period and the highest conversion rate in the growth period, as well as the highest percentage of abdominal fat, were related to the low protein and low amino acid diet without protease. Adding Protease increased the body weight and decreased the conversion factor during the growth period in low protein and low amino acid diets (P<0.05). The use of protease enzyme in low-protein diets improved the digestibility of dry matter and organic matter, and the highest percentage of thigh and spleen and blood HDL concentration was related to the low protein with the addition of protease enzyme (P<0.05). Based on the results, use of protease enzyme in low protein and low amino acid diets improved performance of broiler chicks.

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Iranian Journal of animal Science

Articles in Press, Accepted Manuscript
Available Online from 08 July 2023

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History

  • Receive Date: 29 December 2022
  • Revise Date: 03 June 2023
  • Accept Date: 03 June 2023

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