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Titolo:
Low-protein amino acid-supplemented diets in broiler chickens: effects on performance, carcass characteristics, whole-body composition and efficiencies of nutrient utilisation
Autore:
Aletor, VA; Hamid, I; Niess, E; Pfeffer, E;
Indirizzi:
Univ Bonn, Inst Tierernahrung, D-53115 Bonn, Germany Univ Bonn Bonn Germany D-53115 Inst Tierernahrung, D-53115 Bonn, Germany
Titolo Testata:
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
fascicolo: 5, volume: 80, anno: 2000,
pagine: 547 - 554
SICI:
0022-5142(200004)80:5<547:LAADIB>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
FAT; REQUIREMENTS; QUANTITY; QUALITY; ENERGY; AGE;
Keywords:
low-protein diets; amino acid supplementation; performance; whole-body composition; nutrient utilisation; broiler chicken;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Aletor, VA Fed Univ Technol, Div Anim Prod & Hlth, Div Nutrit Biochem, PMB704, Akure, Nigeria Fed Univ Technol PMB 704 Akure Nigeria MB 704, Akure, Nigeria
Citazione:
V.A. Aletor et al., "Low-protein amino acid-supplemented diets in broiler chickens: effects on performance, carcass characteristics, whole-body composition and efficiencies of nutrient utilisation", J SCI FOOD, 80(5), 2000, pp. 547-554

Abstract

Two concurrent trials were conducted to investigate the influence of low-protein amino acid-supplemented diets on the performance, carcass characteristics, whole-body composition and efficiencies of nutrient utilisation by the male broiler chicken from age 3 to 6 weeks. The first trial comprised five isoenergetic (13.0 MJ kg(-1)) diets containing 225 (control), 210, 190, 172 or 153 g kg(-1) crude protein (CP) supplemented with essential amino acids (EAAs) to meet the minimum National Research Council recommendations. in the second trial a composite mixture of non-essential amino acids (NEAAs)was added to the lower-CP diets (ie 210-153 g kg(-1)) such that they became isoproteinous (N x 6.25) with the 225 g kg(-1) central. Neither the lowering of dietary CP nor NEAA supplementation had any significant influence onweight gain or the relative weights of the various carcass cuts. However, chicks fed the lowest-CP diets consumed more feed (P less than or equal to 0.05) and had poorer (P less than or equal to 0.05) feed conversion efficiency (FCE). NEAA supplementation enhanced FCE to the control levels. Whole-body compositional analysis showed that lowering dietary CP increased (P less than or equal to 0.01) total body fat in a linear fashion (P less than orequal to 0.001; r = -0.72). Equalising dietary GP with the control (ie maintaining identical energy/protein ratio) by NEAA supplementation did not correct for the fat deposition. Total body protein (g kg(-1)) was identical with the control with or without NEAA supplementation. Dietary energy, protein retention efficiency (PRE) and protein efficiency Patio (FER) were more efficient (P less than or equal to 0.01) in the lower-protein diets, while NEAA supplementation significantly (P less than or equal to 0.01) decreasedthe efficiency of N utilisation. Reducing dietary CP from 225 to 153 g kg(-1) decreased N excretion in a highly significant linear fashion (P less than or equal to 0.001; r = 0.73). The nutritional and environmental implications of the increased body fat deposition on the one hand and the decreasedN excretion on the other in the low-protein-fed chickens are discussed andthe need to harmonise these apparently conflicting interests is emphasised. (C) 2000 Society of Chemical Industry.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 03:07:38