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Journal of Dairy Science Vol. 80 No. 11 2901-2906
© 1997 by American Dairy Science Association ®
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Substitution of Neutral Detergent Fiber from Forage with Neutral Detergent Fiber from By-Products in the Diets of Lactating Cows

J. S. Zhu 1, S. R. Stokes 1, and M. R. Murphy 2

1 Department of Animal Science and Food Nutrition, Southern Illinois University, Carbondale 62901
2 Department of Animal Sciences, University of Illinois, Urbana 61801

Four lactating dairy cows that were ruminally and duodenally cannulated were used in an experiment with a 4 x 4 Latin square design to determine the effects of the substitution of neutral detergent fiber (NDF) from forage with NDF from wheat middlings, corn gluten feed, or a blend of distillers dried grains and hominy. Dietary crude protein and NDF averaged 18 and 31%, respectively, for the diet with 71.2% of the NDF from forage (control diet) and for diets with 55% of the NDF from forage (by-product diets). The substitution of NDF from these by-products for forage NDF did not affect dry matter intake (20.1 kg/d) or digestibility of organic matter. Total tract digestibility of acid detergent fiber was lower for cows fed the diet containing a blend of distillers dried grains and hominy than for cows fed the diet containing corn gluten feed. Microbial crude protein synthesis, milk production (23.9 kg/d), and milk fat percentage were similar for all cows, regardless of diet. Cows fed the diets containing wheat middlings or a blend of distillers dried grains and hominy had reduced ruminal pH compared with that of cows fed the diet containing corn gluten feed or the control diet. Diets containing 55% of total NDF from forage with 31% of total NDF from corn gluten feed, wheat middlings, or a blend of distillers dried grains and hominy can supply sufficient effective fiber to maintain normal ruminal function.

Key Words: by-products • forage • neutral detergent fiber

Submitted on October 11, 1996
Accepted on May 23, 1997




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I. R. Ipharraguerre and J. H. Clark
Impacts of the Source and Amount of Crude Protein on the Intestinal Supply of Nitrogen Fractions and Performance of Dairy Cows
J Dairy Sci, May 1, 2005; 88(e_suppl_1): E22 - E37.
[Abstract] [Full Text] [PDF]


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Copyright © 1997 by the American Dairy Science Association ®.