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ANIMAL FEEDS Text 46 COMPOSITION OF FEEDS When a chemist makes an analysis of any feedstuff — clover hay, for example — he determines the amount of water, proteins, ash, crude fibre, and fat contained in the substance. Water. All feeds — even those apparently dry, like co or hay — contain a portion of water varying from 10 to 15 per cent. Roots, such as beets and turnips, contain approximately 90 per cent water. The water in the feed serves til same purpose as ordinary water consumed by the animals. Ash. This is a mineral part of the food substance rd maining after the material is burned. It contains most of the mineral elements which comprise a necessary part of every ration. Proteins. These important constituents are characterized by the fact that they contain nitrogen. They serve the purpose of building up tissue in the body — such as muscle skin, etc.— and constitute the main element in the curd of milk. Lean meat and the white of an egg are examples of nearly pure protein material. All feeds contain more or less proteins. Among the hays, clover, alfalfa, cowpea, and soybean contain the largest amount. Among the common concentrates linseed meal, cottonseed meal, and wheat bran contain relatively large quantities. A certain amount of proteins is indispensable in ration, as nothing can substitute them.