Document Detail

Effects of mastication on digestion of whole cereal grains by cattle.
MedLine Citation:
PMID:  8138495     Owner:  NLM     Status:  MEDLINE    
A study was conducted to evaluate the effects of mastication on the physical breakdown and ruminal digestion of whole cereal grains by cattle. Three Hereford cows (initial BW 557 kg; SD, 17) surgically fitted with ruminal and esophageal fistulas were fed 5.5 kg/d (as-fed basis) of whole barley, corn, or wheat in an experiment designed as a 3 x 3 Latin square. Eating time and chews per kilogram of DM were greater (P < .10) for corn than for barley or wheat. Whole corn was substantially damaged after ingestive mastication, and the majority of kernels were broken into small pieces. Many barley and wheat kernels showed signs of dentition, but most kernels remained intact. Less saliva (P < .10) was added to whole wheat than to barley or corn during ingestive mastication. Cattle fed whole barley spent twice (P < .10) as long ruminating per kilogram of DM as those fed corn, with intermediate times for wheat. Less than 30% of the DM disappeared from unmasticated whole grains during 96 h of ruminal incubation. Ingestive mastication increased DM digestion to 53, 69, and 66% for barley, corn, and wheat, respectively. Mastication alters the kinetics of ruminal digestion of unprocessed cereal grains. Combined with the inherent protein and starch digestibilities of the grain, mastication affects the type and extent of processing required to optimize the utilization of cereal grains by cattle. Unlike barley and wheat, corn kernels are extensively damaged during ingestive mastication, reducing the need for physical processing.
K A Beauchemin; T A McAllister; Y Dong; B I Farr; K J Cheng
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  72     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1994 Jan 
Date Detail:
Created Date:  1994-04-28     Completed Date:  1994-04-28     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  236-46     Citation Subset:  IM    
Agriculture Canada, Research Station, Lethbridge, Alberta.
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MeSH Terms
Ammonia / analysis
Animal Feed
Cattle / physiology*
Dietary Proteins / metabolism
Feces / chemistry
Hydrogen-Ion Concentration
Mastication / physiology*
Osmolar Concentration
Rumen / chemistry,  physiology*
Starch / metabolism
Zea mays
Reg. No./Substance:
0/Dietary Proteins; 7664-41-7/Ammonia; 9005-25-8/Starch

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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