How to evaluate the degradation of feedstuffs for ruminants? Comparison of the gas-test and in situ methods from a literature review | Comment évaluer la dégradation des aliments chez les ruminants? Comparaison de la technique de gaz et in situ
2005
Giger-Reverdin, S.(UMR INRA P-G Physiologie de la Nutrition et Alimentation, Paris (France)) | Morand-Fehr, P. | Sauvant, D.
This study was aimed to compare 2 methods estimating the ruminal degradation of feedstuffs: the in vitro gas production method (HFT) and the nylon bag in situ method. Most of the 299 retained samples were either browses and pastures or straws. In vitro gas production and in situ dry matter degradability were quite highly correlated for a given duration of time, as the correlation coefficient varies between 0.49 and 0.64. However, the HFT was less discriminating in the first hours and underestimated feeds rich in nitrogen or lignin. In vivo dry matter digestibility can be predicted from long term in situ dry matter degradability and voluntary dry matter intake from short-term gas production. Voluntary digestible dry matter intake is a function of medium and long term in situ degradability. As a conclusion, the 2 methods give similar hierarchy for the feedstuffs considered and are complementary to estimate their nutritive value
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