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Poster communications

Faecal-NIRS for predicting animal-to-animal variation in feed organic matter digestibility in cattle

Abstract : Ruminant feed utilisation efficiency is determined in part by organic matter digestibility (OMD). However, OMD is expensive and time consuming to measure it in routine. Faecal near infrared (faecal-NIR) spectroscopy has been developed for predicting OMD in cattle across, but its potential for estimating the between-animal variability of OMD has not been reported. The objective of this study was to evaluate the use of of faecal-NIR for assessing the between-animal variability of OMD across different dietary and experimental conditions in cattle. Faecal samples from individual beef and dairy cows associated (n=454) to individual measured OMD values were used. Values ranged from 55.1 and 85.0% (mean±SD; 70.6±4.20%) for 9 experiments at 4 EU sites using 50 different diets. A NIR calibration model for predicting OMD was obtained and validated by cross-validation. Relationship between cross-validated OMD predictions and measured OMD values were analysed by regression analysis with faecal-NIR cross-validated predictions as fixed factor and diet within experiment as random factor. The faecal-NIR prediction was positive and correlated (P<0.001) to measured OMD. The model residual standard error was 2.05%. The effect of diet within experiment was significant (P<0.05) but minor since it representing 25% of error. For a given diet, the correlation coefficients between measured and faecal-NIR predictions when higher when measured OMD variability between animals was high. Our data highlight the potential of faecal-VIS/NIR to discriminate individuals in terms of OMD within a same diet. It could be used as an economical high-throughput tool for exploring between animal variability of OMD.
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Poster communications
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https://hal.inrae.fr/hal-03085148
Contributor : Sabine Rossi <>
Submitted on : Monday, December 21, 2020 - 3:40:22 PM
Last modification on : Friday, February 5, 2021 - 4:03:32 AM

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  • HAL Id : hal-03085148, version 1

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Donato Andueza, Fabienne Picard, Juliane Pourrat, Anne de la Torre, Emmanuel Devant, et al.. Faecal-NIRS for predicting animal-to-animal variation in feed organic matter digestibility in cattle. 71. Annual Meeting of the European Federation of Animal Science (EAAP 2020), Dec 2020, Wageningen, Netherlands. Wageningen Academic Publishers, pp.508, 2020. ⟨hal-03085148⟩

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