An analysis of the fatty acid composition of raw ruminant milks in the Province of Ontario.

摘要

This thesis is an investigation of the variations in the milk fatty acid composition as affected by season and region, breed, and other ruminant species. A cold lipid extraction method based on Folch, Lees, and Sloane (J Biol Chem 1957 226) and Bligh and Dyer (Can J Biochem Physiol 1959 37) was used with methyl esters analyzed on a gas chromatograph equipped with a CP Sil 88 column.Seasonal and regional effects, breed as well as smaller ruminant effects were seen in vaccenic, linoleic, and rumenic acids content, total CLA and other PUFAs. Goat and sheep milks had the most SFAs, especially SCFAs. Jerseys and sheep contained the most vaccenic acid whereas goats had the most linoleic acid. Sheep had the highest total CLA content, especially rumenic acid, and also had the most PUFAs. The results provide data which could aid the Ontario dairy industry to produce a potentially healthful product which would benefit all stakeholders.