Fatty acid interrelationships in plasma,liver, muscle and adipose tissues of cattle fed safflower oil protected from ruminal hydrogenation |
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Authors: | L J Cook T W Scott G J Faichney H Lloyd Davies |
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Affiliation: | (1) Division of Animal Physiology, C.S.I.R.O., Prospect, N.S.W., Australia;(2) M.O. Franklin Laboratory, University of Sydney, Camden, N.S.W., Australia |
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Abstract: | Steers were given diets containing formaldehyde-treated casein-safflower oil supplements, in which the constituent 18∶2 was
protected from ruminal hydrogenation. A similar group was given unsupplemented diets. The fatty acid compositions of plasma,
liver, muscle and adipose tissue lipids were determined in both groups of cattle after 0, 2, 4 and 8 weeks of experimentation.
The proportion of 18∶2 in the triglycerides was markedly increased on feeding the supplement and the rate of incorporation
into the plasma triglycerides was higher than that in the triglycerides of muscle and adipose tissue. Associated with this
increase there were compensatory decreases in the proportions of 16∶0 and 18∶1 but no consistent change in the proportion
of 18∶0. The proportion of 18∶2 in the plasma phospholipids and cholesteryl esters was initially much higher than in the triglycerides
and this was further increased by feeding the safflower oil supplement. A linear relationship existed between the proportion
of 18∶2 in the phospholipids and cholesteryl esters of plasma. The supplement also caused substantial increases in the proportion
of 18∶2, both in phospholipids from liver and muscle and in cholesteryl esters from liver, and there were compensatory decreases
in the proportions of other unsaturated fatty acids, e.g., 18∶1, 18∶3, 22∶6. These studies demonstrate that when ruminal hydrogenation
was circumvented by feeding formaldehyde-treated casein-safflower oil particles, the linoleic acid was absorbed and the pattern
of incorporation into plasma and tissue lipids was similar to that in nonruminants. |
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