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Predicting feed digestibility from NIRS analysis of pig faeces

Published online by Cambridge University Press:  23 December 2014

D. Bastianelli ,
L. Bonnal ,
Y. Jaguelin-Peyraud  and
J. Noblet
D. Bastianelli*
Affiliation:
CIRAD, UMR SELMET, Baillarguet TA C-112/A, F-34398 Montpellier Cedex 05, France
L. Bonnal
Affiliation:
CIRAD, UMR SELMET, Baillarguet TA C-112/A, F-34398 Montpellier Cedex 05, France
Y. Jaguelin-Peyraud
Affiliation:
INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France
J. Noblet
Affiliation:
INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France
*
†E-mail: [email protected]
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Abstract

Digestibility is a key parameter in the evaluation of feeds; however, the measurements on animals require heavy experimental trials, which are hardly feasible when large numbers of determinations are required – for example, in genetic studies. This experiment aimed at investigating the possibility to predict digestibility from NIRS spectra measured on faeces. A total of 196 samples were available from a digestibility experiment investigating the effects of age and genetic background of Large White pigs fed the same diet, rich in fibre (NDF=21.4% DM). Digestibility of dry matter (dDM), organic matter (dOM), nitrogen content (dN), energy (dE) and apparent digestible energy content (ADE) were calculated, as well as total N content of faeces (N). The faeces samples were submitted to reflectance NIRS analysis after freeze-drying and grinding. Calibration errors and validation errors were, respectively, 0.08 and 0.13% DM for total N in faeces, 0.97% and 1.08% for dDM, 0.79% and 1.04% for dOM, 1.04% and 1.47% for dN, 0.87% and 1.12% for dE and 167 and 213 kJ/kg DM for ADE. These results indicate that NIRS can account for digestibility differences due to animal factors, with an acceptable accuracy. NIRS appears to be a promising tool for large-scale evaluations of digestibility. It could also be used for the study of digestibility of different feeds, after appropriate calibration based on a wide range of feed types.

Keywords

pigfaecesdigestibilityNIR spectroscopy
Type
Research Article
Information
animal , Volume 9 , Supplement 5 , May 2015 , pp. 781 - 786
Copyright
© The Animal Consortium 2014 

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