In this study, five barley cultivars (Arabi Abiad, improved Arabi Abiad, Arabi Aswad, Furat 1, Furat 2) from the harvest of 1999 season were used .The chemical composition, Amino acid content, B-Glucan content, viscosity, cell wall compounds, and metabolic energy were determined in two laboratories in Germany .A metabolism trial was also conducted to study the nitrogen balance, dry matter, Organic matter, ash, and some other productivity parameters. Results showed that the influence of barley varieties on chemical composition of the grains was clearly visible. The crude protein content ranged from 138 for Furat 1 to 169 gr/Kg dry matter for Arabi Abiad. The difference in starch content resulted in differences in metabolic energy Values from 12.4 for Furat 1 to 13.3 MJ/Kg dry matter for Arabi Aswad. The food assimilation trial showed that the varieties Arabi Aswad gave the best productivity parameters, and the crude protein content did not adversely affect the nitrogen balance in all the barley varieties meald, but it was the lowest for the Arabi Aswad variety meal (p <0.05). There were no significant differences in dry matter and organic matter digestibility for diets containing Arabi Abiad, Furat 1 and Furat 2.