concentrate of any dairy cattle should contain 15% Digestable crude protein, 70% Total Digestable nutrients, 2500 Kcal Energy per KG, Fiber less than 11%, common salt 1.5%, Dicalcium phosphate (feed grade)1%, Mineral Mixture 1%, Soda bi carb 0.33%, and Bye pass fat 2%. You may fix these variables by using any combination of raw materials and also get least cost formulation by use of linear programing or simplex.