Document Detail

Effects of replacing dietary starch with sucrose on ruminal fermentation and nitrogen metabolism in continuous culture.
MedLine Citation:
PMID:  15545386     Owner:  NLM     Status:  MEDLINE    
A dual-effluent continuous-culture system was used to evaluate the effects of partially replacing cornstarch with sucrose in a total mixed ration on ruminal fermentation and N metabolism. The 4 treatments were 0 (control), 2.5, 5.0, and 7.5% sucrose and, respectively, 7.5 (control), 5.0, 2.5, and 0% cornstarch in a total mixed ration containing 20% corn silage and 40% alfalfa silage. Fermenters were fed 4 times a day during four 9-d periods with sampling beginning on d 6. Replacing cornstarch with sucrose did not alter ruminal pH (5.97), total volatile fatty acids (VFA) (104.4 mmol/L), or the acetate to propionate ratio (2.16); however, branched-chain volatile fatty acids were higher for the control treatment compared with the 7.5% sucrose treatment. Five hours postfeeding, sucrose treatments significantly altered molar proportions of all volatile fatty acids, and acetate-to-propionate and glucogenic-to-lipogenic ratios. Digestibility of dry matter and N were not affected by treatment, but digestibility of total non-structural carbohydrates was increased with sucrose treatments. A quadratic effect was noted for neutral detergent fiber (NDF) digestibility as sucrose replaced starch. A higher NDF digestibility (66.1 vs. 59.9%) was observed for the 7.5% sucrose treatment compared with the other 2 sucrose treatments. Levels of ammonia N were within an acceptable range to support microbial protein synthesis and did not differ among treatments (mean=9.23 mg/dL). Sucrose inclusion in the total mixed ration did not affect bacterial N synthesis. Results indicate that (at the levels tested in this study) inclusion of sucrose in the diet when rumen-degradable protein is adequate does not affect ruminal fermentation.
J E Vallimont; F Bargo; T W Cassidy; N D Luchini; G A Broderick; G A Varga
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  87     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-11-16     Completed Date:  2005-04-18     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:  4221-9     Citation Subset:  IM    
Department of Dairy and Animal Science, The Pennsylvania State University, University Park, 16802, USA.
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MeSH Terms
Animal Feed
Animal Nutritional Physiological Phenomena
Bacterial Proteins / biosynthesis
Cattle / metabolism*
Dietary Fiber / administration & dosage,  metabolism
Dietary Sucrose / administration & dosage*,  metabolism
Dose-Response Relationship, Drug
Fatty Acids, Volatile / analysis
Fermentation / drug effects
Hydrogen-Ion Concentration
Lactation / metabolism*
Medicago sativa
Nitrogen / metabolism
Rumen / chemistry,  metabolism*,  microbiology
Starch / administration & dosage*,  metabolism
Zea mays
Reg. No./Substance:
0/Bacterial Proteins; 0/Dietary Sucrose; 0/Fatty Acids, Volatile; 7727-37-9/Nitrogen; 9005-25-8/Starch

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