Etude de la dégradabilité enzymatique des aliments concentrés et sous-produits

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Abstract
A method of enzymatic degradability measurement was elaborated. The method was based on 3 main steps: an aqueous hydrolysis; an incubation in a glucolytic enzyme (amylase, cellulase, hemicellulase) mixture; an incubation in a pepsin chlorhydric buffer. When considering 37 feedstuffs of different origins (2.8 .ltoreq. crude fiber .ltoreq. 48.3/100 of DM [dry matter]) with in vivo measured values of organic matter digestibility (30.7 .ltoreq. OMD [organic matter digestibility] .ltoreq. 92.3/100), the enzymatic degradability allowed to predict more accurately the feed OMD than the separate data of crude fiber NDF [neutral detergent fiber], ADF [acid detergent fiber], and AD [acid detergent] lignin contents. A similar observation remained valuable when the 18 concentrates feedstuffs were considered separately. The combination of the NDF and ADLignin contents allowed to obtain a precision similar to the enzymatic degradability for the 37 (RSD [residual standard deviation] = 4.84/100 vs. 4.97/100) or the 18 (RSD = 3.44 vs. 3.32) above mentioned feeds. When considering the 11 compound feeds, the ADLignin content gave the best prevision (RSD = 2.06 vs. 3.29/100). The described method was tested into an EEC ring-test.