| Long-term effects of feeding monensin on milk fatty acid composition in lactating dairy cows. | |
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MedLine Citation:
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PMID: 17954753 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The objective of this study was to determine the long-term effects of feeding monensin on milk fatty acid (FA) profile in lactating dairy cows. Twenty-four lactating Holstein dairy cows (1.46 +/- 0.17 parity; 620 +/- 5.9 kg of live weight; 92.5 +/- 2.62 d in milk) housed in a tie-stall facility were used in the study. The study was conducted as paired comparisons in a completely randomized block design with repeated measurements in a color-coded, double blind experiment. The cows were paired by parity and days in milk and allocated to 1 of 2 treatments: 1) the regular milking cow total mixed ration (TMR) with a forage-to-concentrate ratio of 60:40 (control TMR; placebo premix) vs. a medicated TMR [monensin TMR; regular TMR + 24 mg of Rumensin Premix per kg of dry matter (DM)] fed ad libitum. The animals were fed and milked twice daily (feeding at 0830 and 1300 h; milking at 0500 and 1500 h). Milk samples were collected before the introduction of treatments and monthly thereafter for 6 mo and analyzed for FA composition. Monensin reduced the percentage of the short-and medium-chain saturated FA 7:0, 9:0, 15:0, and 16:0 in milk fat by 26, 35, 19, and 6%, respectively, compared with the control group. Monensin increased the percentage of the long-chain saturated FA in milk fat by 9%, total monounsaturated FA by 5%, total n-6 polyunsaturated FA (PUFA) by 19%, total n-3 PUFA by 16%, total cis-18:1 by 7%, and total conjugated linoleic acid (CLA) by 43% compared with the control group. Monensin increased the percentage of docosahexaenoic acid (22:6n-3), docosapentaenoic acid (22:5n-3), and cis-9, trans-11 CLA in milk fat by 19, 13, and 43%, respectively, compared with the control. These results suggest that monensin was at least partly effective in inhibiting the biohydrogenation of unsaturated FA in the rumen and consequently increased the percentage of n-6 and n-3 PUFA and CLA in milk, thus enhancing the nutritional properties of milk with regard to human health. |
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Authors:
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N E Odongo; M M Or-Rashid; R Bagg; G Vessie; P Dick; E Kebreab; J France; B W McBride |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of dairy science Volume: 90 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2007 Nov |
Date Detail:
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Created Date: 2007-10-23 Completed Date: 2008-09-22 Revised Date: - |
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: 5126-33 Citation Subset: IM |
Affiliation:
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Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1. nodongo@uoguelph.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle / physiology* Fats / analysis, chemistry Fatty Acids / analysis* Female Ionophores / administration & dosage, pharmacology* Isomerism Lactation / drug effects*, physiology Linoleic Acids, Conjugated / analysis Milk / chemistry* Monensin / administration & dosage, pharmacology* Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Fats; 0/Fatty Acids; 0/Ionophores; 0/Linoleic Acids, Conjugated; 17090-79-8/Monensin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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