Abstract
1. 1. Total plasma lipids were determined in Africandar cows (Bos indicus) during 10 monthly intervals. The animals were kept in a low rainfall area of Zimbabwe, with a low (2.7 ha/animal) and a high (8.1 ha/animal), pasture allowance. 2. 2. Fatty acid composition was determined in total plasma lipids from individual samples taken at monthly intervals during 10 months. Pasture allowance had no significant effect on the qualitative and quantitative composition of the fatty acids. 3. 3. There was an increase in C 18:2 ω6 and C 18:3 ω3 with the onset of the rainy season, followed by a decrease with the onset of the dry season. Only the month to month variations in C 18:3 ω3 were highly significant ( P < 0.01 ). 4. 4. The C 18:2 ω6 and C 18:3 ω3 content in plasma lipids seems to be limited by the percentage of these fatty acids in the pasture grasses. In comparison with animals fed pasture grasses in temperate climate, with a high PUFA content, the animals in the experiment had a relatively high content C 18:2 ω6 but a very low content of C 18:3 ω3. 5. 5. Animals of the same breed, kept on a low energy diet but with a relatively high content of C 18:2 ω6, showed, a significantly higher ( P < 0.05 ) content of this acid in plasma lipids than grazing animals.
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