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Meta-analysis of the response of growing pigs to the isoleucine concentration in the diet

Published online by Cambridge University Press:  28 February 2012

J. van Milgen ,
M. Gloaguen ,
N. Le Floc'h ,
L. Brossard ,
Y. Primot  and
E. Corrent
J. van Milgen*
Affiliation:
INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 PEGASE, F-35000 Rennes, France
M. Gloaguen
Affiliation:
INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 PEGASE, F-35000 Rennes, France AJINOMOTO EUROLYSINE S.A.S., 75817 Paris Cedex 17, France
N. Le Floc'h
Affiliation:
INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 PEGASE, F-35000 Rennes, France
L. Brossard
Affiliation:
INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 PEGASE, F-35000 Rennes, France
Y. Primot
Affiliation:
AJINOMOTO EUROLYSINE S.A.S., 75817 Paris Cedex 17, France
E. Corrent
Affiliation:
AJINOMOTO EUROLYSINE S.A.S., 75817 Paris Cedex 17, France
*
†Email: jaap.vanmilgen@rennes.inra.fr
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Abstract

The efficiency of nitrogen utilization will be highest when the amino acid (AA) supply approaches the requirement of the animal. With the availability of different crystalline AA, it is theoretically possible to formulate low-protein diets for growing pigs in which seven AA are co-limiting for performance. In such a diet, the concentration of Lys, Met, Met + Cys, Thr, Trp and Val and a seventh AA would exactly match the requirement. To determine the extent to which low-protein diets can be used, it is important to have reliable information about the requirements for these AA. Isoleucine is often considered the seventh-limiting AA in diets for growing pigs; however, information about the Ile requirement is limited and sometimes conflicting. The purpose of this study was to carry out a meta-analysis of the available literature information to determine the Ile requirement in growing pigs. A total of 46 Ile dose–response experiments were identified that used at least four concentrations of Ile in the diet. Because of differences in experimental design, both the Ile concentration and the response criteria were standardized. In 13 dose–response experiments, there was no indication of a response to an increasing Ile concentration. For the other 33 experiments, a response to the increasing Ile concentration was observed and the Ile requirement estimates ranged from 53% to 114% of that of the National Research Council (1998). An Ile concentration below the requirement resulted in important reductions in both feed intake and growth. A 10% reduction in the Ile concentration (below the requirement) resulted in a 15% reduction in feed intake and a 21% reduction in daily gain. The use of blood products in the diet was the main factor determining whether a response to the Ile concentration was observed or not. Blood meal and blood cells are protein sources with a very low Ile concentration, but with high or very high concentrations of Leu, Val, Phe and His. Some of these AA compete with Ile for catabolic pathways or transport across the blood–brain barrier, thereby potentially increasing the requirement for Ile. In diets without blood products, the Ile requirement appears to be lower than the currently recommended requirement. On the basis of the outcome of this study, we recommend a Ile : Lys requirement ratio of at least 50% on a standardized ileal digestible basis.

Keywords

isoleucinepigsnutrient requirementsmeta-analysisamino acids
Type
Full Paper
Information
animal , Volume 6 , Issue 10 , October 2012 , pp. 1601 - 1608
Copyright
Copyright © The Animal Consortium 2012

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