The average composition of amino acid profile of feed’s protein (0) was compared with the amino acid rumen undegraded protein (RUP), by calculating the distances of x² between each file of two proteins. The greater value of x², the greater difference between compared proteins. The biggest distance in cereals between 0 fraction and RUP was noted for rye (x² = 73.97), lower for barley (x² = 31.22) and the lowest for wheat (x² = 20.6). The composition of wheat AARUP is the closest to the AA content in feed. The differences in 0 protein fraction and RUP were of a little importance for soybean meal and for field bean (x² = 15.3 and x² = 23.4, respectively). Bigger distance level between protein fractions was noted for peas (x² = 81.2). Amino acid profiles of 0 fraction and amino acid profiles of RUP in hay of the Italian rye-grass and of the red clover were similar (x² = 46.5 and x² = 59.6, respectively), but they were considerably different from analogous protein fractions of meadow fescue and perennial rye-grass (x² = 144.5 and x² = 167.86, respectively).
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