Animal Production Science Animal Production Science Society
Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Influence of low-protein and low-amino acid diets with different sources of protease on performance, carcasses and nitrogen retention of broiler chickens

Z. U. Rehman A B , J. Kamran C , M. E. Abd El-Hack D G , M. Alagawany D G , S. A. Bhatti C , G. Ahmad E , A. Saleem F , Z. Ullah C , R. M. K. Yameen C and C. Ding A G
+ Author Affiliations
- Author Affiliations

A Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences.

B Faculty of Veterinary and Animal Sciences, PMAS Arid Agriculture University, Rawalpindi, Pakistan.

C Faculty of Animal Husbandry, University of Agriculture, Faisalabad, Pakistan.

D Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.

E Quality Assurance Manager, Sadiq Feeds Pvt. Ltd, Rawalpindi, Pakistan.

F Faculty of Food, Nutrition and Human Sciences, University of Agriculture, Faisalabad, Pakistan.

G Corresponding authors. Email: shoveldeen@shvri.ac.cn; mmalagwany@zu.edu.eg; m.ezzat@zu.edu.eg

Animal Production Science - https://doi.org/10.1071/AN16687
Submitted: 20 October 2016  Accepted: 27 February 2017   Published online: 30 March 2017

Abstract

A 42-day experiment was conducted with 625 1-day-old male Hubbard chickens to evaluate the performance, carcass traits, nitrogen retention and economics of broiler chickens fed low protein and amino acid diets supplemented with different protease sources. Treatments included positive (PC) and negative (NC) controls (PC at 19.3% protein vs NC at 18.8% protein), with NC containing 7% less digestible amino acids. The other three treatment groups were based on the NC diet supplemented with 0.05% Cibenza® DP100 (CB), 0.02% Ronozyme® (RZ) or 0.02% Winzyme pro plus (WZ). Birds fed the PC, CB and WZ diets achieved the heaviest bodyweight compared with those fed the NC diet at end of the experiment. Total feed intake of birds fed the PC diet was higher (P < 0.05) than that of birds fed the NC diet. Feed conversion ratio was numerically significantly (P = 0.005) improved with all tested groups in comparison with NC throughout the experiment. European production index was similar (P > 0.05) among birds fed the PC, NC, RZ or WZ diets. All carcass parameters studied, including dressing, heart, gizzard, giblets, chest meat, thigh meat and abdominal fat percentages, were not significantly (P > 0.05) affected by feeding on the different sources of protease. Broilers fed the PC diet or diets formulated with all protease sources had higher (P < 0.05) nitrogen retention than did birds fed the NC diet. The supplementation of protease to low-protein and low-amino acid diets resulted in higher profit margin in broilers. It is concluded that supplementing exogenous protease to broiler diets containing low protein and amino acids improved the growth performance, feed utilisation, carcass traits, nitrogen retention and net returns of broiler chickens.

Additional keyword: economics.


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