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Journal of Dairy Science Vol. 84 No. 2 453-461
© 2001 by American Dairy Science Association ®
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Effect of Variation in Proportion of Cornmeal and Steam-Rolled Corn in Diets for Dairy Cows on Behavior, Digestion, and Yield and Composition of Milk

K. Uchida 1, C. S. Ballard 2, P. Mandebvu 2, C. J. Sniffen 2, and M. P. Carter 2

1 W. H. Miner Agricultural Research Institute, Chazy, NY 12921-0090 and Zen-Noh National Federation of Agricultural Co-operative Associations, Tokyo, Japan
2 W. H. Miner Agricultural Research Institute, Chazy, NY 12921-0090

Sixty-six lactating multiparous Holstein cows (113 ± 46 DIM) housed in a free-stall facility were blocked and assigned randomly to one of three treatments to evaluate the effects on animal performance from feeding cornmeal, cornmeal mixed with steam-rolled corn in a ratio of 1:1 on dry matter basis, or steam-rolled corn. The only difference in the dietary ingredients was the type of corn, which was included in the total mixed ration (TMR) at 17% of dry matter. The densities (g/L) of cornmeal and steam-rolled corn were, respectively, 635 and 553. Diets were fed as TMR and were formulated according to the Cornell Penn Miner Dairy® nutrition model. The TMR consisted of 40% forage and 60% concentrate on dry matter basis. The first 2 wk of the 8-wk study was a preliminary period, and data collected during this period were used as covariate in statistical analysis of production data collected during wk 6 to 8. Treatment diets were fed from wk 3 to 8. Total tract digestibilities of dry matter, organic matter, crude protein, starch, and neutral detergent fiber were not significantly different among treatments. Cows fed TMR containing steam-rolled corn had higher body condition and ruminated longer. However, feeding cornmeal and steam-rolled corn together did not improve dry matter and nutrient digestion, milk yield, 3.5% fat-corrected milk yield, and percentage and yield of fat, crude protein, true protein, and lactose in milk, and milk urea nitrogen. In conclusion, feeding steam-rolled corn improved animal body condition and rumination. Partial or complete substitution of cornmeal by steam-rolled corn in diets for lactating dairy cows did not improve dry matter and nutrient digestion, milk yield, and milk composition.

Key Words: steam-rolled corn • behavior • digestion • milk yield

Submitted on July 24, 2000
Accepted on September 8, 2000






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