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PSXI-19 A Novel Calculation Method in the Difference Procedure for Determining Energy Digestibility of Ingredients for Pigs

Journal of animal science, 2023-11, Vol.101 (Supplement_3), p.565-566 [Peer Reviewed Journal]

The Author(s) 2023. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. 2023 ;The Author(s) 2023. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. ;ISSN: 0021-8812 ;EISSN: 1525-3163 ;DOI: 10.1093/jas/skad281.662

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  • Title:
    PSXI-19 A Novel Calculation Method in the Difference Procedure for Determining Energy Digestibility of Ingredients for Pigs
  • Author: Kim, Hansol ; Kim, Beob G
  • Subjects: Dependent variables ; Diet ; Digestibility ; Independent variables ; Ingredients ; Mathematical analysis ; Swine
  • Is Part Of: Journal of animal science, 2023-11, Vol.101 (Supplement_3), p.565-566
  • Description: Abstract The objective was to suggest a novel calculation method in the difference procedure for determining the apparent total tract digestibility (ATTD) of gross energy (GE) of ingredients for pigs. This procedure involves formulating a basal diet (BD) and a test diet (TD) which contains a test ingredient (TI), feeding these diets to pigs, determining ATTD of GE in the diets, and calculating ATTD of GE in a TI by extrapolation. To calculate ATTD of GE in a TI, it is necessary to calculate the proportional contribution of GE in the BD (PBD) and the TI (PTI) to the TD using the following equations: PBD = (analyzed GE of BD × inclusion rate of BD)/analyzed GE of TD; PTI = (analyzed GE of TI × inclusion rate of TI)/analyzed GE of TD. One of the assumptions for the difference procedure is that GE values in a BD and a TI are additive (PBD + PTI = 1). However, the analyzed GE in the TD is not always exactly equal to the calculated value based on analyzed GE values in the BD and the TI. To investigate the influence of non-additivity of GE in a TD on the ATTD of GE in a TI, 33 observations were collected from 9 studies that determined ATTD of GE using the difference procedure. A ratio of analyzed GE in TD to calculated GE in TD (GEAnalyzed:GECalculated, %) ranged from 98.7 to 101.3%. The following relationship was established: PTD = PTI + PBD = (GEAnalyzed:GECalculated)–1. Corrected PBD and PTI were calculated: corrected PBD = PBD × (GEAnalyzed:GECalculated)–1; corrected PTI = PTI × (GEAnalyzed:GECalculated)–1; and corrected PTD = corrected PBD + corrected PTI = 1. Four values for the ATTD of GE in TI were obtained or calculated: 1) presented in the literature (ATTDLiterature), 2) calculated based on the PTI (ATTDNon-corrected), 3) calculated based on the corrected PTI (ATTDCorrected), and 4) calculated based on the calculated GE in TD (ATTDCalculated). Three ratios (%) for each observation were computed, namely, ATTDLiterature:ATTDCalculated, ATTDNon-corrected:ATTDCalculated, and ATTDCorrected:ATTDCalculated. The GEAnalyzed:GECalculated was used as an independent variable against the ratios as dependent variable. Results indicated that a 1 percentage unit increase in GEAnalyzed:GECalculated led to 3.47% (r2 = 0.67) and 4.28% (r2 = 0.92) increases in ATTDLiterature:ATTDCalculated and ATTDNon-corrected:ATTDCalculated, respectively. However, for the ATTDCorrected:ATTDCalculated, a 1 percentage unit increase in GEAnalyzed:GECalculated only increased the value by 0.54% (r2 = 0.88). Overall, even a small deviation between analyzed and calculated GE can cause large errors in the digestibility of TI, but the use of corrected proportional contributions suggested in the present work can mitigate the problem.
  • Publisher: US: Oxford University Press
  • Language: English
  • Identifier: ISSN: 0021-8812
    EISSN: 1525-3163
    DOI: 10.1093/jas/skad281.662
  • Source: Open Access: PubMed Central
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