Abstract
Information collected at the Dairying Research Corporation milk composition laboratories on the fatty acid composition
of milkfat spanning 1994/95 to 1998/99 dairying seasons has been summarised. The data comprised 1350 determinations
in 18 different experiments from 965 individual Friesian cows that calved in July/August and grazed solely on pasture. A
seasonal effect on fatty acid composition was observed. In general, concentrations of fatty acid groups and individual fatty
acids were similar in spring and autumn but differed in summer. The ratio of an estimate of preformed (total fatty acids
>C
17:0
) and an estimate of de novo- (total fatty acids
Proceedings of the New Zealand Society of Animal Production, Volume 60, Hamilton, 314-317, 2000
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