Document Detail

Conjugated linoleic acid and vaccenic acid in rumen, plasma, and milk of cows fed fish oil and fats differing in saturation of 18 carbon fatty acids.
MedLine Citation:
PMID:  14672195     Owner:  NLM     Status:  MEDLINE    
The objective of this study was to examine the effect of feeding fish oil (FO) along with fat sources that varied in saturation of 18 carbon fatty acids (high stearic, high oleic, high linoleic, or high linolenic acids) on rumen, plasma, and milk fatty acid profiles. Four primiparous Holstein cows at 85 d in milk (+/- 40) were assigned to 4 x 4 Latin squares with 4-wk periods. Treatment diets were 1) 1% FO plus 2% commercial fat high in stearic acid (HS); 2) 1% FO plus 2% fat from high oleic acid sunflower seeds (HO); 3) 1% FO plus 2% fat from high linoleic acid sunflower seeds (HLO); and 4) 1% FO plus 2% fat from flax seeds (high linolenic; HLN). Diets were formulated to contain 18% crude protein and were composed of 50% (dry basis) concentrate mix, 25% corn silage, 12.5% alfalfa silage, and 12.5% alfalfa hay. Milk production, milk protein percentages and yields, and dry matter intake were similar across diets. Milk fat concentrations and yields were least for HO and HLO diets. The proportion of milk cis-9, trans-11 conjugated linoleic acid (CLA; 0.71, 0.99, 1.71, and 1.12 g/100 g fatty acids, respectively), and vaccenic acid (TVA; 1.85, 2.60, 4.14, and 2.16 g/100 g fatty acids, respectively) were greatest with the HLO diet. The proportions of ruminal cis-9, trans-11 CLA (0.09, 0.16, 0.18, and 0.16 g/100 g fatty acids, respectively) were similar for the HO, HLO, and HLN diets and all were higher than for the HS diet. The proportions of TVA (2.85, 4.36, 8.69, and 4.64 g/100 g fatty acids, respectively) increased with the HO, HLO, and HLN diets compared with the HS diets, and the increase was greatest with the HLO diet. The effects of fat supplements on ruminal TVA concentrations were also reflected in plasma triglycerides, (2.75, 4.64, 8.77, and 5.42 g/100 g fatty acids, respectively); however, there were no differences in the proportion of cis-9, trans-11 CLA (0.06, 0.07, 0.06, and 0.07 g/100 g fatty acids, respectively). This study further supports the significant role for mammary delta-9 desaturase in milk cis-9, trans-11 CLA production.
A A AbuGhazaleh; D J Schingoethe; A R Hippen; K F Kalscheur
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  86     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-12-15     Completed Date:  2004-03-15     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:  3648-60     Citation Subset:  IM    
Dairy Science Department, South Dakota State University, Brookings 57007-0647, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Cattle / blood,  metabolism*
Dietary Fats / administration & dosage
Fats / analysis
Fish Oils / administration & dosage*,  chemistry,  metabolism
Linoleic Acids, Conjugated / analysis*,  blood
Milk / chemistry*
Oleic Acids / analysis*,  blood
Random Allocation
Rumen / chemistry*
Triglycerides / blood
Reg. No./Substance:
0/Dietary Fats; 0/Fats; 0/Fish Oils; 0/Linoleic Acids, Conjugated; 0/Oleic Acids; 0/Triglycerides; 143-25-9/11-octadecenoic acid

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