[Nutrient composition of some newly bred high protein and/or high lysine grains and their digestibility determined on growing pigs].

With the view to complementing the feedstuff data store and, consequently, to further improving the GDR Feed Evaluation System, some newly bred high-protein and/or high-lysine cereal varieties and strains (spring barley, winter wheat, maize) were studied for their nutrient composition and digestibility. Apart from from WEENDER's feed analysis technique, more recent methods were applied to determine total fat (after HCl treatment), carbohydrates (enzymatic method), lignin and amino acids. The digestibility of the nutrients was determined using growing pigs of different live weight, the test rations being made up of the cereals under and supplementations of limiting amino acids as well as vitamins and minerals. In comparison with the values from currently applied tables, the newly bred strains and varieties proved to have markedly higher contents of crude protein, digestible crude protein, lysine and energetic feed equivalents. Compared to crude fat, the total fat values proved markedly higher in the barley and wheat samples. The readily soluble and easily hydrolizable carbohydrates found with the new analysis procedure suggested, were 100% digestible in all cereal samples used. Lignin proved the constituent most difficult to digest and must be regarded as virtually undigestible in the case of pigs.