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Diet and the lipid composition of adipose tissue in the young lamb
Author(s) -
Noble R. C.,
Christie W. W.,
Moore J. H.
Publication year - 1971
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740221204
Subject(s) - adipose tissue , polyunsaturated fatty acid , phospholipid , triglyceride , fatty acid , glycerol , chemistry , composition (language) , biochemistry , food science , endocrinology , medicine , biology , cholesterol , linguistics , philosophy , membrane
The changes in the lipid composition of the perirenal adipose tissue obtained from groups of lambs receiving either ewes' milk or a reconstituted low‐fat milk powder have been studied during the first 8 days after birth. The triglycerides were further analysed by a stereospecific analytical procedure to obtain the intramolecular distribution of the fatty acids between the hydroxyl groups of the glycerol moeity. The percentage composition of the major lipid fractions in the perirenal adipose tissue from the naturally fed lambs remained similar to that of the adipose tissue obtained from the lambs at birth, but in the lambs receiving the artificial diet the relative concentration of the triglycerides was considerably reduced and that of the unesterified fatty acid and phospholipid fractions increased. At birth 18 :1 was the major fatty acid present in the triglyceride, unesterified fatty add and phospholipid fractions. Any polyunsaturated fatty acids were confined to the phospholipid fraction. Although there were negligible concentrations of the C18 polyunsaturated fatty acids, the C20 and C22 polyunsaturated fatty acids comprised some 20% of the fatty acids of the phospholipids. In the naturally fed lambs the concentration of 18: 2ω6 increased considerably during the 8 days after birth and there was a decrease in the concentration of 20 : 3ω9. In the artificially fed lambs the concentration of 20 : 3ω9 remained similar to that found at birth and there was no accumulation of 18 : 2ω6. In the triglycerides at birth 70–80% of 18 : 1‐cis was in the 2‐position and the saturated fatty acids were located mainly in the 1‐and 3‐positions. In both groups of lambs the concentration of 18 : 1‐cis decreased and the concentration of 18 : 0 increased after birth. In the naturally fed lambs the increase in 18 : 0 occurred mainly in positions 1‐and 3‐but in the artificially fed lambs the concentration of 18 : 0 also markedly increased in position 2. The changes in concentration of 16 : 0 paralleled that of 18 : 0. In the naturally fed lambs the concentrations of 14:0, 18: 1‐trans and 18 : 2ω6 which were probably of dietary origin increased considerably. 14 : 0 and 18 : 1 trans were concentrated largely in positions 1 and 3 whilst 18 : 2ω6 was concentrated mainly in position 2.