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Effect of low-protein diets with crystalline amino acid supplementation on egg production, blood parameters and nitrogen balance in laying Japanese quails

Posted on 26. February, 2015.

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Several dietary strategies can be used to reduce N excretion in poultry manure, including the supplementation of synthetic amino acid to low-protein diets, the utilisation of hydroxy-analogues or keto acids of amino acids to supplement low-protein diets, or the concept of a dietary ideal protein ratio. 

A total of 120 Japanese quails were randomly distributed into six dietary groups to evaluate the effect of lowcrude protein (CP) diet supplemented with crystalline amino acids on productive and reproductive performance, blood parameters and nitrogen (N) balance. Treatments consisted of six different diets: a control diet (20% CP), a low-CP (16%) diet supplemented with threonine (Thr), valine (Val) and tryptophan (Trp), three low-CP diets supplemented with individual Thr, Val or Trp, and a low-CP diet supplemented with all aforementioned amino acids. None of the growth traits examined were influenced either by dietary treatments or by egg production (P > 0.05). The highest fertility percentages (88.2%) were observed in quails fed the low-CP diet without
crystalline amino acids supplementation followed by low-CP diet supplemented with Val (86.2%), whereas the highest hatchability (from fertile eggs) percentage was observed in quails fed low-CP diet plus Trp. Egg shell percentages from quails fed the control diet were higher (P < 0.05) compared to other dietary treatments during the whole feeding period. Yolk percentage was decreased (P < 0.01) with the low-CP diet supplemented with amino acids. Blood protein and ammonia levels were decreased (P < 0.05) by reducing the dietary CP level or by supplementing amino acids to the low-CP diet. Reducing the CP level in the diet with amino acids supplementation in laying quails decreased the daily N excretion (P < 0.05). It is concluded that reducing the CP level in a diet supplemented with crystalline amino acids supports reproductive performance in quails, and is a valuable strategy for decreasing feeding cost and mitigating ammonia emission.

Read the full article in Avian Biology Research, Volume 7, Number 4, December 2014, pp. 235-243.

Authors: Mahmoud Alagawanya*, Mohamed Ezzat Abd El-Hacka, Vito Laudadiob and Vincenzo Tufarellib
aPoultry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
bDepartment of Emergency and Organ Transplantation (DETO), Section of Veterinary Science and Animal Production, University of Bari ‘Aldo Moro’, Valenzano 70010, Bari, Italy

Keywords: amino acids, egg quality, nitrogen balance, production, quail


Image: Japanese Quail, Copyright: Nataliya_Ostapenko