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COMPOSITION OF FEEDS 2 COMPOSITION OF FEEDS Tables 1â6 present the composition of important United States-Canadian feeds. Nutrient concentrations are organized as follows: Table 1 Energy values, proximate analyses, plant cell wall constituents, and acid detergent fiber Table 2 Mineral composition Table 3 Vitamin composition Table 4 Amino acid values Table 5 Fat and fatty acid values Table 6 Mineral supplement composition INTERNATIONAL FEED NOMENCLATURE The nomenclature of the feeds under which the analytical data are shown primarily follows the International Feed Vocabulary of Harris et al. (1980, 1981). Many feeds in the United States have official names and definitions designated by the Association of American Feed Control Officials (AAFCO, 1979). Frequently, however, these names are common or trade names and the origin of the feed name does not follow a standardized naming system. The International Feed Vocabulary is designed to give a comprehensive name to each feed as concisely as possible. Each feed name was coined by using descriptors taken from one or more of six facets: 1. Origin consisting of scientific name (genus, species, variety) and common name (generic name; breed or kind; strain or chemical formula) 2. Part fed to animals as affected by process(es) 3. Process(es) and treatment(s) to which the part has been subjected 4. Stage of maturity or development 5. Cutting (applicable to forages) 6. Grade (official grades with guarantees) See Table 7 for stage of maturity terms for plants. A complete International Feed Name consists of all descriptors applicable to the feeds. Definitions for the part and process descriptors are given by Harris et al. (1981). INTERNATIONAL FEED CLASSES Feeds are grouped into eight classes on the basis of their composition and their use in formulating diets (Table 8). These classes, by necessity, are arbitrary, and in borderline cases a feed is assigned to a class according to its most common use in typical feeding practice. INTERNATIONAL FEED NUMBER (IFN) Each International Feed Name is assigned a five-digit International Feed Number (IFN) for its identification. This numerical representation is the link between the International Feed Names and chemical and biological data in the USA databank. The numbers are particularly useful as a tag to recall the nutrient data for calculating diets. The Feed Class Number (Table 8) is entered in front of the IFN when feed tables are prepared.