The average milk yields and ECM from cows offered the CON and DGM diets were not different (P > 0.05) and were higher (P < 0.01) than their counterpart measurements in cows offered the EGM diet (Table 2). Milk fat concentration was lower (P < 0.001) for cows offered DGM diet than for cows offered either the CON or EGM diets. Despite this, fat yields were similar (P> 0.05) for cows fed the DGM and EGM diets, which were lower (P < 0.001) than fat yields from cows fed
the CON diet. Protein and lactose concentrations were similar for cows offered all diets, but both protein and lactose yields were lower (P < 0.01) for cows offered the EGM diet in comparison to the yields of these components from cows offered the CON and DGM diets. Somatic cell counts (log10) were not affected (P > 0.05) by dietary treatment. Cows fed the CON diet gained significantly (P < 0.001) more BW than cows fed either the DGM or EGM diets.