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Journal of Dairy Science Vol. 76 No. 5 1324-1333
© 1993 by American Dairy Science Association ®
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Interactions of Fiber and Nonstructural Carbohydrates on Lactation and Ruminal Function

P. Feng 1, W. H. Hoover 1, T. K. Miller 1, and R. Blauwiekel 1

1 Division of Animal and Veterinary Sciences West Virginia University Morgantown 26506-6108

Four Holstein cows averaging 147 DIM and fitted with ruminal and duodenal cannulas were used in a 4 x 4 Latin square trial to determine diet effects on DMI, milk production, and ruminal metabolism. Diets contained either rapidly or slowly degraded NDF, referred to as low fill and high fill, respectively, combined with two percentages of nonstructural carbohydrate. Treatments were 39% nonstructural carbohydrate (low or high fill) and 29% nonstructural carbohydrate (low or high fill). Intake of DM was not affected by either fill or nonstructural carbohydrate. Ruminal NDF digestibilities averaged 43.1 and 35.6% for the low fill and high fill diets, respectively. Ruminally digested nonstructural and total carbohydrate increased, but milk production decreased, as nonstructural carbohydrate increased from 29 to 39% in diets. Liquid and solid ruminal passage rates, as measured by Co-EDTA and Yb, respectively, were reduced by either 39% nonstructural carbohydrate or low fill diets. Lower microbial N flow to the duodenum and lower efficiency of microbial growth also were observed for diets with 39% nonstructural carbohydrate. The combination of 39% nonstructural carbohydrate and rapidly degraded gave the highest DM and nonstructural carbohydrate digestion in the rumen but resulted in low microbial N synthesis per day and the least microbial N per kilogram of OM digested.

Key Words: fiber • nonstructural carbohydrate • interaction • rumen

Submitted on September 10, 1992
Accepted on January 4, 1993




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Copyright © 1993 by the American Dairy Science Association ®.