Document Detail

Proteolysis, fermentation efficiency, and in vitro ruminal digestion of peanut stover ensiled with raw or heated corn.
MedLine Citation:
PMID:  16027205     Owner:  NLM     Status:  MEDLINE    
Peanut stover (PS) is similar to full-bloom alfalfa hay in chemical composition. The objective of this study was to assess the effect of adding raw or heated corn meal to PS at ensiling on silage N components, fermentation acids, and digestion by ruminal microorganisms. The PS was collected after harvesting of peanuts and ensiled immediately without and with addition of raw or heated corn meal (100 g/kg of fresh weight). Corn was added to PS so that the initial mixture would contain adequate dry matter (DM) (approximately 30%) and additional nonfiber carbohydrate to enhance silage fermentation. After 8 wk of silo fermentation, corn-treated silages contained less structural carbohydrates but more non-fiber carbohydrates compared with the untreated control. A shift from hemicellulose to nonfiber carbohydrate use during silage fermentation was evident by corn treatment. Additional corn at ensiling resulted in silage N with less water-soluble N, protein N, nonprotein N, nonprotein nonammonia N (peptides plus amino acids), and ammonia N. Based on changes in soluble nonprotein N before and after ensiling, the amount of proteolysis was approximately 66% for control silage and was nearly 40% lower in response to corn treatment. Adding corn increased silage lactic acid, but both acetic and propionic acids decreased. These changes were reflected in the lower pH and higher fermentation efficiency with corn-treated silages. More DM was digested and greater amounts of volatile fatty acids, except for branched-chain acids, were produced in vitro by ruminal microorganisms with corn-treated silages. In addition, incubations with silage treated with heated corn contained higher concentrations of acetic and propionic acids compared with raw corn. In vitro ammonia accumulation per unit of DM digested was lower for corn treatments than the control, and for heated corn vs. raw corn-treated silage. These results indicate that supplementation of either raw or heated corn on PS at ensiling could minimize proteolysis and improve fermentation efficiency. Advantages from using heated vs. raw corn could extend beyond silage fermentation and include rumen microbial fermentation.
C-M J Yang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  88     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-07-19     Completed Date:  2006-02-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2903-10     Citation Subset:  IM    
Department of Animal Science, National I-Lan University, I-Lan, Taiwan 26015, Republic of China.
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MeSH Terms
Acetic Acid / analysis
Ammonia / metabolism
Arachis hypogaea / metabolism*
Carbohydrates / analysis
Fatty Acids, Volatile / analysis
Food Handling / methods
Hot Temperature
Hydrogen-Ion Concentration
Lactic Acid / analysis
Nitrogen / analysis
Peptide Hydrolases / metabolism*
Propionic Acids / analysis
Rumen / metabolism*,  microbiology
Silage / analysis
Zea mays*
Reg. No./Substance:
0/Carbohydrates; 0/Fatty Acids, Volatile; 0/Propionic Acids; 50-21-5/Lactic Acid; 64-19-7/Acetic Acid; 7664-41-7/Ammonia; 7727-37-9/Nitrogen; 79-09-4/propionic acid; EC 3.4.-/Peptide Hydrolases

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

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