| Response of milk fatty acid composition to dietary supplementation of soy oil, conjugated linoleic acid, or both. | |
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MedLine Citation:
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PMID: 18096948 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Thirty-six Holstein cows were blocked by parity and allotted by stage of lactation to 6 treatments to evaluate the effects of dietary soy oil, conjugated linoleic acid (CLA; free acid or calcium salt), or both, on CLA content of milk. Diets were fed for 4 wk and are as follows: (1) control, (2) control + 5% soy oil, (3) control + 1% CLA, (4) control + 1% Ca(CLA)2, (5) control + 1% CLA + 4% soy oil, and (6) control + 1% Ca(CLA)2 + 4% soy oil. Rumen volatile fatty acid concentrations, blood fatty acid concentrations, milk yield, and milk composition were measured weekly or biweekly. Dry matter intake and milk yield were recorded daily. Dietary supplementation of soy oil or CLA had no effect on daily milk yield, milk protein concentration and production, or milk lactose concentration and production. Supplementation of unsaturated fatty acids as soy oil, CLA, or Ca(CLA)2 increased total fatty acid concentration in plasma, decreased milk fat concentration and production, and had no effect on rumen volatile fatty acid concentrations. The weight percentage of CLA in milk was increased from 0.4 to 0.7% with supplementation of 1% CLA, to 1.2% with supplementation of soy oil, and to 1.3% with supplementation of 1% CLA plus soy oil. Supplementation with Ca(CLA)2 or Ca(CLA)2 + soy oil increased the CLA content of milk fat to 0.9 and 1.4%, respectively. In summary, adding 5% soy oil was as effective as supplementing CLA, Ca(CLA)2, or a combination of 1% CLA (free acid or calcium salt) + 4% soy oil at increasing CLA concentrations in milk fat. Feeding CLA as the calcium salt resulted in greater concentrations of CLA in milk fat than did feeding CLA as the free acid. Dietary supplementation of 5% soy oil or 4% soy oil + 1% CLA as the free acid or the calcium salt increased the yield of CLA in milk. |
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Authors:
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Y Huang; J P Schoonmaker; B J Bradford; D C Beitz |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of dairy science Volume: 91 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2007-12-21 Completed Date: 2008-02-12 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: 260-70 Citation Subset: IM |
Affiliation:
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Nutritional Physiology Group, Department of Animal Science, Iowa State University, Ames 50011, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animal Nutritional Physiological Phenomena Animals Calcium / metabolism* Cattle / blood, metabolism* Dietary Supplements Fatty Acids / blood, metabolism* Female Linoleic Acids, Conjugated / administration & dosage*, metabolism Lipids / blood Milk / chemistry, metabolism*, secretion Random Allocation Soybean Oil / administration & dosage*, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids; 0/Linoleic Acids, Conjugated; 0/Lipids; 7440-70-2/Calcium; 8001-22-7/Soybean Oil |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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