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Sixty-four Holstein milk cattle (140 ± 26 d in milk) had been arbitrarily assigned to 8 pens (8 pets per pen). Treatments had been organized in a 2 × 2 factorial arrangement with 2 levels of starch and 2 types of fiber and were allotted to 8 pens (2 pens per therapy). Treatments were (1) 15% dry floor corn and 24% CS, (2) 15% dry surface corn and 24% BP changing CS, (3) 30% dry ground corn and 24% CS, and (4) 30% dry floor corn and 24% BP replacing CS. The test lasted for 47 d and