Back to Search
Start Over
The fatty acid profile of subcutaneous and abdominal fat in dairy cows with left displacement of the abomasum.
- Source :
-
Journal of dairy science [J Dairy Sci] 2012 Jul; Vol. 95 (7), pp. 3756-65. - Publication Year :
- 2012
-
Abstract
- The objective of this study was to determine the fatty acid (FA) profile and assess desaturase indices of nonesterified fatty acids (NEFA) in the blood, as well as in the abdominal (ABD) and subcutaneous (SUBC) fat stores, in dairy cows with left displacement of the abomasum (LDA). Blood, ABD, and SUBC samples were taken from 50 Holstein cows offered for surgery to correct LDA. The FA profile of the 3 compartments was determined by gas chromatography after lipid extraction, methylation, and, in the case of blood plasma, separation of lipid classes. The most abundant FA in all 3 compartments were 16:0, 18:0, and 18:1 cis-9, with a total proportion of 82.5, 68.0, and 74.1g/100 g of FA in ABD, NEFA, and SUBC, respectively. A principal component analysis was performed on the entire FA profile as well as on the Δ(9)-desaturase indices (14:1 cis-9/14:0, 16:1 cis-9/16:0, 18:1 cis-9/18:0). The principal component analysis extracted 2 principal components (PC), representing 51.6% (PC1) and 21.1% (PC2) of the total variance in FA composition of the 3 compartments. The loading plot for the regression factors revealed a strong positive correlation between PC1 with the Δ(9)-desaturase indices and the proportions of 14:1 cis-9 and 16:1 cis-9, and revealed a negative correlation with the proportion of 18:0 and saturated FA. The correlation with PC2 was positive for the proportion of unsaturated FA, 18:2n-6, and 18:3n-3, and negative for the proportion of 14:0, 16:0, and saturated FA. The SUBC could be distinguished from the NEFA and ABD by a positive score for PC1, whereas differentiation among the latter 2 compartments could be made by a positive (NEFA) or negative (ABD) score for PC2. The Δ(9)-desaturase indices for C14 and C16 differed between all compartments but were numerically closer for NEFA and ABD versus NEFA and SUBC. The desaturase indices of the main FA (18:1 cis-9 and 18:0) did not differ between NEFA and ABD. These results support the existence of a different FA composition in ABD compared with SUBC. The greater similarity between the FA profiles of ABD and NEFA compared with SUBC and NEFA and the closer desaturase indices of ABD and NEFA support the hypothesis of a preferential mobilization of ABD fat in dairy cows with LDA.<br /> (Copyright © 2012 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.)
- Subjects :
- Abomasum physiology
Animals
Aspartate Aminotransferases blood
Cattle
Cattle Diseases physiopathology
Chromatography, Gas veterinary
Fatty Acids, Nonesterified analysis
Fatty Acids, Nonesterified blood
Female
gamma-Glutamyltransferase blood
Abomasum abnormalities
Cattle Diseases metabolism
Fatty Acids analysis
Subcutaneous Fat chemistry
Subcutaneous Fat, Abdominal chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1525-3198
- Volume :
- 95
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Journal of dairy science
- Publication Type :
- Academic Journal
- Accession number :
- 22720932
- Full Text :
- https://doi.org/10.3168/jds.2011-5092