New concepts of feed evaluation for ruminants with emphasis on roughages and feed intake

TitleNew concepts of feed evaluation for ruminants with emphasis on roughages and feed intake
Publication TypeJournal Article
Year of Publication2000
AuthorsOrskov, ER
JournalAsian-Australasian Journal of Animal Sciences
Volume13
Pagination128-136
Keywordsanalytical methods, Animal Science: Animal Nutrition (General) [LL500], Animals, Artiodactyla, Auxiliary Disciplines: Techniques and Methodology [ZZ900], Chordata, digestibility, feed evaluation, feed intake, feeds, Forage and Feed Products (Non-human): Feed Composition and Quality [RR300], mammals, metabolizable energy, Nutritive Value, Rumen, rumen microorganisms, Ruminants, ungulates, vertebrates
Abstract

A possible new feed evaluation system for roughages is discussed based on rumen microbial degradation. It is based on determination of the following characteristics of feeds: The soluble fraction (A), the insoluble but fermentable fraction (B) and the degradation rate of the insoluble but fermentable fraction (C). A formula is given for the determination of B and C using nylon bag incubations. The voluntary intake prediction from degradation characteristics appears to be more accurate than from metabolizable energy or TDN. From these values a feed potential index can be generated which can be used to assess the potential intake and thus potential animal production. It enables feed potential to be matched to animal potential or to develop appropriate animal production systems to match feed potential