| Effects of replacing dietary starch with sucrose on ruminal fermentation and nitrogen metabolism in continuous culture. | |
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MedLine Citation:
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PMID: 15545386 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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J E Vallimont; F Bargo; T W Cassidy; N D Luchini; G A Broderick; G A Varga |
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Publication Detail:
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Type: In Vitro; Journal Article |
Journal Detail:
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Title: Journal of dairy science Volume: 87 ISSN: 0022-0302 ISO Abbreviation: J. Dairy Sci. Publication Date: 2004 Dec |
Date Detail:
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Created Date: 2004-11-16 Completed Date: 2005-04-18 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
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Languages: eng Pagination: 4221-9 Citation Subset: IM |
Affiliation:
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Department of Dairy and Animal Science, The Pennsylvania State University, University Park, 16802, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed Animal Nutritional Physiological Phenomena Animals Bacterial Proteins / biosynthesis Cattle / metabolism* Dietary Fiber / administration & dosage, metabolism Dietary Sucrose / administration & dosage*, metabolism Digestion* Dose-Response Relationship, Drug Fatty Acids, Volatile / analysis Female Fermentation / drug effects Hydrogen-Ion Concentration Lactation / metabolism* Medicago sativa Nitrogen / metabolism Rumen / chemistry, metabolism*, microbiology Silage Starch / administration & dosage*, metabolism Zea mays |
| Chemical | |
Reg. No./Substance:
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0/Bacterial Proteins; 0/Dietary Sucrose; 0/Fatty Acids, Volatile; 7727-37-9/Nitrogen; 9005-25-8/Starch |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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