Including 39 to 49% DG in the diets of calves <3 mo of age decreased ADG by 6 to 10% and decreased DM digestibility by 10% in the 7-wk-old calf. Starters containing up to 20% DG had no effect on ADG and efficiency in calves <2 mo old or on rumen develop-ment of 35-d-old calves. Inclusion of 20% DG in the diet of 2- to 3-mo-old calves decreased ADG by 4%. High milk intake significantly decreased starter intake, which negatively affected rumen development in 5-wk-old calves. These results support including <20% DG in grower diets of calves <3 mo old and up to 20% DG in starters fed to calves <2 mo old. Feeding higher rates of MR decreased grain intake and limited rumen development.
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