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Cellulose acetate, a new candidate feed supplement for ruminant animals: In vitro evaluations

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Title: Cellulose acetate, a new candidate feed supplement for ruminant animals: In vitro evaluations
Authors: Watabe, Y. Browse this author
Suzuki, Y. Browse this author →KAKEN DB
Koike, S. Browse this author
Shimamoto, S. Browse this author
Kobayashi, Y. Browse this author →KAKEN DB
Keywords: cellulose acetate
rumen fermentation
rumen microbiota
Issue Date: Dec-2018
Publisher: Elsevier
Journal Title: Journal of dairy science
Volume: 101
Issue: 12
Start Page: 10929
End Page: 10938
Publisher DOI: 10.3168/jds.2018-14969
PMID: 30268629
Abstract: Cellulose acetate (CA), a derivative of cellulose in which some hydroxyl groups are substituted with acetyl groups, was evaluated as a new cellulosic feed source for ruminants. In the present work, a series of in vitro studies was carried out to determine how CA supplementation affects rumen fermentation and microbiota. Batch culture studies were conducted to select the type of CA suitable for feed use and to define the optimal supplementation level. Rumen fluid from 2 Holstein cows was mixed with McDougall's buffer in test tubes into which grass hay and concentrate containing a fiber source [cellulose (control), water-soluble CA (WSCA), or insoluble CA] had been placed. Each fiber source was supplemented at 10% of total substrate. Tubes were incubated for 24 h to determine fermentation and microbial parameters. Then, the dose response of these parameters to different supplementation levels of WSCA (0, 7.5, 15, 22.5, and 30%) was tested in the same manner. We also operated a continuous culture system with WSCA supplementation and evaluated the effects on digestibility, fermentation, and microbial parameters. The supplementation level of WSCA was set at 15% of total feed. In batch culture studies, WSCA, but riot insoluble CA, yielded dose-dependent increases in ruminal acetate levels. In the continuous culture system study, WSCA yielded increases in ruminal acetate levels and in the abundance of bacteria of the genus Prevotella, including Prevotella ruminicola. Dry matter digestibility and total gas production were not affected. These results suggest that WSCA supplementation at 15% of total feed yielded increased acetate levels without negatively affecting feed digestion; these effects may reflect activation of Prevotella species. As ruminal acetate is involved in milk fat synthesis, WSCA can be considered as a candidate feed additive suitable for dairy cattle.
Rights: © 2018, The Authors. Published by FASS Inc. and Elsevier Inc. on behalf of the American Dairy Science Association®.This is an open access article under the CC BY-NC-ND license (
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小林 泰男

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