It is very important to know the feeding value and metabolizable energy content of feedstuffs for balancing animal diets. Feeding value and energy content of animal feeds change according to maturity stage, soil conditions, fertilization, climate, processing methods, etc. There are no adequate tables that show the basic feeding values of feedstuffs grown in different regions of Turkey; therefore, the present study analyzed 8 different feedstuffs and 56 dairy and beef cattle mixed feeds to determine their feeding value and energy content. Additionally, the possibility of using these feedstuffs for ruminant nutrition is discussed. Crude protein content of the dairy cattle mixed feeds and cotton seed values were lower than standard values. This finding is very important for animal feeding in the region.