Alfalfa hay, alfalfa haylage, corn silage and a 1:1 combination of corn silage and alfalfa hay were evaluated as sources of forage cell wall in diets for twelve early to mid lactation Holstein cows. Diets were formulated to contain equal amounts of natural detergent fiber (31.5%), crude protein (17.1%) and NE. (1.65 M K Cal/ KgDM) in an incomplete change — over design. Dry matter intake was highest for cows fed alfalfa haylage diet (P
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