Want to study the effect of protein level 2 level (a1 = a2 = 16% 20% CP, CP), together with the effect of energy level (b1 = b2 = 70% to 80% of TDN, TDN) in feed on growth of a legend by using a consistent definition of a trial 16 individual cows get recipes, random. Get information about ADG (kg/d), as follows