Definition of apparent, true, and standardized ileal digestibility of amino acids in pigs

H. H. Stein; M. F. Fuller; P. J. Moughan; B. Sève; R. Mosenthin; A. J.M. Jansman; J. A. Fernández; C. F.M. de Lange

doi:10.1016/j.livsci.2007.01.019

Definition of apparent, true, and standardized ileal digestibility of amino acids in pigs

H. H. Stein, M. F. Fuller, P. J. Moughan, B. Sève, R. Mosenthin, A. J.M. Jansman, J. A. Fernández, C. F.M. de Lange

Research output: Contribution to journal › Article › peer-review

Abstract

Measures of ileal digestibility (ID) are used routinely as estimates of amino acid (AA) bio-availability in pig feed ingredients. Values for ID may be expressed as apparent (AID), standardized (SID), or true (TID). Values for AID are calculated by deducting the total ileal outflow of AA (the sum of endogenous losses (IAA_end) and non-digested dietary AA) from dietary AA intake. The IAA_end may be separated into basal losses, which are not influenced by feed ingredient composition, and specific losses induced by feed ingredient characteristics such as anti-nutritional factors and dietary fiber. If the AID values are corrected for total IAA_end, then values for TID are calculated. Lack of additivity of AID values in feed formulation may be overcome by correcting AID values for basal IAA_end only, which yields SID values. Until reliable procedures for the routine measurement of specific IAA_end become available, it is suggested that SID values are used for feed formulation. It is advisable that basal IAA_end are measured in digestibility experiments and that these losses are reported with SID values.

Original language	English (US)
Pages (from-to)	282-285
Number of pages	4
Journal	Livestock Science
Volume	109
Issue number	1-3
DOIs	https://doi.org/10.1016/j.livsci.2007.01.019
State	Published - May 15 2007

Keywords

Amino acids
Digestibility
Pigs

ASJC Scopus subject areas

Animal Science and Zoology
General Veterinary

Online availability

10.1016/j.livsci.2007.01.019

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abstract = "Measures of ileal digestibility (ID) are used routinely as estimates of amino acid (AA) bio-availability in pig feed ingredients. Values for ID may be expressed as apparent (AID), standardized (SID), or true (TID). Values for AID are calculated by deducting the total ileal outflow of AA (the sum of endogenous losses (IAAend) and non-digested dietary AA) from dietary AA intake. The IAAend may be separated into basal losses, which are not influenced by feed ingredient composition, and specific losses induced by feed ingredient characteristics such as anti-nutritional factors and dietary fiber. If the AID values are corrected for total IAAend, then values for TID are calculated. Lack of additivity of AID values in feed formulation may be overcome by correcting AID values for basal IAAend only, which yields SID values. Until reliable procedures for the routine measurement of specific IAAend become available, it is suggested that SID values are used for feed formulation. It is advisable that basal IAAend are measured in digestibility experiments and that these losses are reported with SID values.",

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AU - Stein, H. H.

AU - Fuller, M. F.

AU - Moughan, P. J.

AU - Sève, B.

AU - Mosenthin, R.

AU - Jansman, A. J.M.

AU - Fernández, J. A.

AU - de Lange, C. F.M.

PY - 2007/5/15

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Definition of apparent, true, and standardized ileal digestibility of amino acids in pigs

Abstract

Keywords

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