Relationship among compositional data of fibrous by-products as determined by two different extractions in the detergent system of analysis. Influence on the prediction of the digestibility
1990
Rebole, A. | Alvira, P. | Gonzalez, G.
Both direct and sequential extractions in the detergent system of analysis were applied to some fibrous by-products (cereal and legume straws, legume bagasse, vine branch silage and poplar bark) to determine which gave the better prediction of the digestibility through the summative equation, and to study the interferences of fibre-bound nitrogen and tannins. Permanganate lignin gave a lower correlation than acid-detergent lignin when figures from direct and sequential extractions were compared. Fibre-bound nitrogen (as N X 6.25) was positively correlated to permanganate lignin, whereas tannins were positively correlated to acid-detergent lignin. Figures for permanganate lignin from sequential extraction and acid-detergent lignin from direct extraction gave a good prediction of in-vitro digestibility, when they were used in the summative equation. More research into lignin, tannins and the detergent system of analysis of fibrous by-products should be done in order to improve and clarify the prediction of digestibility.
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