Document Detail

Response of milk fatty acid composition to dietary supplementation of soy oil, conjugated linoleic acid, or both.
MedLine Citation:
PMID:  18096948     Owner:  NLM     Status:  MEDLINE    
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.
Y Huang; J P Schoonmaker; B J Bradford; D C Beitz
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of dairy science     Volume:  91     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-12-21     Completed Date:  2008-02-12     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:  260-70     Citation Subset:  IM    
Nutritional Physiology Group, Department of Animal Science, Iowa State University, Ames 50011, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Calcium / metabolism*
Cattle / blood,  metabolism*
Dietary Supplements
Fatty Acids / blood,  metabolism*
Linoleic Acids, Conjugated / administration & dosage*,  metabolism
Lipids / blood
Milk / chemistry,  metabolism*,  secretion
Random Allocation
Soybean Oil / administration & dosage*,  metabolism
Reg. No./Substance:
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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