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Article| Volume 82, ISSUE 1, P110-121, January 1999

Evaluation of the Physical Structure of Fodder Beets, Potatoes, Pressed Beet Pulp, Brewers Grains, and Corn Cob Silage1

Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(99)75215-X
Evaluation of the Physical Structure of Fodder Beets, Potatoes, Pressed Beet Pulp, Brewers Grains, and Corn Cob Silage1
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      Abstract

      The physical structure of fodder beets, raw potatoes, ensiled pressed sugar beet pulp, ensiled brewers grains, and corn cob silage was evaluated in diets containing concentrates and either corn silage or grass silage as the roughage source. In one series of experiments, the chewing activity of eight cows was measured over 4 d. The beet pulp and fodder beets were added to the two roughage sources at two ratios [20:80 and 35:65, dry matter (DM) basis]. Potatoes, brewers grains, and corn cob silage were fed in a fixed amount (5 to 6 kg of DM) with corn silage. The chewing indexes (eating and ruminating time per kilogram of DM ingested) for fodder beets and beet pulp averaged 34.3 and 32.3 min/kg of DM, respectively, and were hardly affected by the nature of the roughage or by the inclusion ratio. The chewing indexes for potatoes, brewers grains, and corn cob silage were 23.7, 56.6, and 41.6 min/kg of DM, respectively. In another series of experiments using 8 to 11 cows, the ratio of roughage to concentrates was lowered weekly by 5 percentage units, and the critical roughage portion of the diet was determined (i.e., the amount just before a lack of physical structure was observed). The roughage source was either fed alone or supplemented with about 4 kg of DM of the experimental feed. The critical roughage portion of the diet decreased when the experimental feeds were added; the decrease was greatest with ensiled pressed beet pulp and was lowest with corn cob silage.

      Key words

      Abbreviation Key:

      BG (brewers grains), CCS (corn cob silage), CI (chewing index), CRP (critical roughage portion), CS (corn silage), EI (eating index), FB (fodder beets), GS (grass silage), PBP (ensiled pressed sugar beet pulp), RI (ruminating index), RwP (raw potatoes)

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      Article info

      Publication history

      Accepted: August 26, 1998
      Received: March 10, 1998

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(99)75215-X

      Copyright

      © 1999 American Dairy Science Association. Published by Elsevier Inc.

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