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Journal of Dairy Science Vol. 72 No. 9 2331-2338
© 1989 by American Dairy Science Association ®
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Dietary Interaction of Cane Molasses with Source of Roughage: Intake and Lactation Effects1

J. L. Morales, H. H. Van Horn and J. E. Moore

Dairy Science and Animal Science Departments, University of Florida, Gainesville 32611

ABSTRACT

Effects of cane molasses at 0, 4, and 8% of DM in complete mixed diets were evaluated when molasses was fed to lactating dairy cows with cottonseed hulls, alfalfa haylage, or both combined. Thirty-six mature Holstein cows from mid to late lactation were used in a partially balanced incomplete block design with three 28-d periods. Variables measured were DM intake, milk yield, and composition. With cottonseed hull diets (30% of DM), molasses improved milk yield, milk fat percentage, solids-corrected milk, and feed efficiency. Dry matter intake was not affected by molasses. With alfalfa haylage diets (35% of DM), 8% molasses depressed actual milk yield and solids-corrected milk, DM intake, milk fat percentage, milk protein percentage, and feed efficiency. Milk fat percentage was increased with 4% molasses. With 65% alfalfa haylage diets, most variables measured were unaffected by molasses; however, with 8% molasses, DM intake increased and milk protein percentage decreased. In diets with both roughages combined, molasses did not affect any variable measured; however, these diets gave highest solids-corrected milk yields. Results show clearly that molasses effects depend on percentage molasses and type and amount of roughage in the diet.

FOOTNOTES

1 Florida Agricultural Experiment Station Journal Series Number 9627.






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Copyright © 1989 by the American Dairy Science Association ®.