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Using a computer-controlled simulated digestion system to predict the energetic value of corn for ducks.

Authors :
Zhao, F.
Zhang, L.
Mi, M.
Zhang, F.
Hou, S. S.
Zhang, Z. Y.
Source :
Poultry Science. Jun2014, Vol. 93 Issue 6, p1410-1420. 11p.
Publication Year :
2014

Abstract

Two experiments were conducted to de-velop a computer-controlled digestion system to simu-late the digestion process of duck for predicting the concentration of ME and the metabolizability of gross energy (GE) in corn. In a calibration experiment, 30 corn-based calibration samples with a previously pub-lished ME concentration in 2008 were used to develop the prediction models for in vivo energetic values. The linear relationships were established between in vivo ME concentration and in vitro digestible energy (IVDE) concentration, and between in vivo metabolizability of GE (ME/GE) and in vitro digestibility of GE (IVDE/ GE), respectively. In a validation experiment, 6 sources of corn with previously published ME concentration in 2008 randomly selected from the primary corn-growing regions of China were used to validate the prediction models established in the calibration experiment. The results showed that in calibration samples, the IVDE concentration was positively correlated with the AME (r = 0.9419), AMEĀ„ (r = 0.9480), TME (r = 0.9403), and TMEn concentration (r = 0.9473). Similarly, the IVDE/GE was positively correlated with the AME/GE (r = 0.95987), AMEn/GE (r = 0.9641), TME/GE (r = 0.9588), and TMEn/GE (r = 0.9637). The coefficient of determination greater than 0.88 and 0.91, and residual SD less than 45 kcal/kg of DM and 1.01% were ob-served in the prediction models for ME concentrations and ME/GE, respectively. Twenty-nine out of 30 cali-bration samples showed differences less than 100 kcal/ kg of DM and 2.4% between determined and predict-ed values for 4 ME (AME, AMEn, TME, and TMEn) and for 4 ME/GE (AME/GE, AMEn/GE. TME/GE, and TMEn/GE), respectively. Using prediction mod-els developed from 30 calibration samples, 6 validation samples further showed differences less than 100 kcal/ kg of DM and 2% between determined and predicted values for ME and ME/GE, respectively. Therefore, the computer-controlled simulated digestion system can be used to predict the ME and ME/GE of corn for ducks with acceptable accuracy. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00325791
Volume :
93
Issue :
6
Database :
Academic Search Index
Journal :
Poultry Science
Publication Type :
Academic Journal
Accession number :
96352194
Full Text :
https://doi.org/10.3382/ps.2013-03532