Energy and protein evaluation of conventional and non-conventional feedstuffs. Possiblities and pitfalls | Evaluation d'énergie et de protéine des aliments conventionnels et non conventionnels. Possibilities et difficultés
2005
Weisbjerg, M.R.(Danish Institute of Agricultural Sciences, Research Centre Foulum, Tjele (Denmark)) | Hvelpund, T.
Feed evaluation is essential as it allows for optimisation of ration composition and, by this, prevention of malnutrition. For non-conventional feeds, where experience is scarce or lacking, it is even more important. Feed evaluation includes assessment of chemical composition, energy and protein value, feed intake potential and content of eventually antinutritional or even toxic substances. Uncritical use of laboratory methods for analysing non-conventional feeds can result in severe errors in feed values. Especially for low digestible feeds and feeds containing antinutritional substances, different methods may differ considerably in their prediction of digestibility. Conventional concentrates and temperate forages have generally high total true protein availabilities; around 93 per cent. However, many non-conventional feeds like some tropical forages and browses can be very low in total true protein availability, and even protein rich feeds can result in a negative protein supply for the animal.
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