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Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

Published online by Cambridge University Press:  06 January 2016

D. C. Z. Donato ,
N. K. Sakomura ,
E. P. Silva ,
A. R. Troni ,
L. Vargas ,
M. A. N. Guagnoni  and
B. Meda
D. C. Z. Donato
Affiliation:
Animal Science Department, Universidade Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brazil
N. K. Sakomura*
Affiliation:
Animal Science Department, Universidade Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brazil
E. P. Silva
Affiliation:
Animal Science Department, Universidade Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brazil
A. R. Troni
Affiliation:
Animal Science Department, Universidade Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brazil
L. Vargas
Affiliation:
Animal Science Department, Universidade Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brazil
M. A. N. Guagnoni
Affiliation:
Animal Science Department, Universidade Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brazil
B. Meda
Affiliation:
INRA, CAPES-COFECUB, UR83 Recherches Avicoles, F-37380 Nouzilly, France
*
†E-mail: sakomura@fcav.unesp.br
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Abstract

The intensification of livestock have increased the emission of pollutants to the environment, leading to a growing interest in seeking strategies that minimise these emissions. Studies have shown that it is possible to manipulate diets by reducing CP levels and thus reducing nitrogen (N) excretion, without compromising performance. However, there is no knowledge of any study that has focused on reducing N excretion and relating this reduction to individual amino acids. This study investigated the effect of dietary methionine+cysteine (MC) and threonine (THR), the two most limiting amino acids for broiler production, on nitrogen excretion (NE) and nitrogen deposition (ND) and determined the efficiency of utilisation of both amino acids for protein deposition. Six trials were conducted to measure the NE and ND in broiler chickens during three rearing phases in response to dietary amino acid. The efficiency of utilisation of the amino acids was calculated by linear regression of body protein deposition and the amino acid intake. Despite the differences between sexes and phases, the efficiency of utilisation was the same, being 0.60 and 0.59 for MC and THR, respectively. The rate of NE behaved exponentially, increasing with amino acid intake, and can exceed 50% of N intake, being higher than ND. On average, for a reduction in intake of each unit of MC or THR (mg) there is a reduction of 0.5% of NE. Although this reduction seems low, considering that it corresponds to changes in one amino acid only, the impact on a large scale would be significant. Knowledge of how animals respond to NE and ND/protein deposition according to amino acid dietary content may represent new efforts towards reducing the impact on environment.

Keywords

amino acidsefficiency of utilisationenvironmental pollutionnutritionpoultry
Type
Research Article
Information
animal , Volume 10 , Issue 6 , June 2016 , pp. 903 - 910
Copyright
© The Animal Consortium 2016 

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