Bovine Milk Fatty Acid Profiles Produced by Feeding Diets Containing Solin, Flax and Canola

¹ Department of Animal Science, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
² Department of Foods and Nutrition, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2

Fatty acid profiles with emphasis on linoleic, linolenic, oleic, and conjugated linoleic acid (CLA) were compared in milk from dairy cows fed diets containing 3.25% supplemental fat and a control diet containing no supplemented fat. The fat was supplied by either whole ground solin, flax, or canola oilseed. Solin (linola) is a new cultivar of flax that contains 28% linoleic acid in the seed. Twelve multiparous Holstein cows were assigned to one of four dietary treatments. The experimental design was a 4 ± 4 Latin square with each period consisting of 16 d for adjustment to the diet followed by a 5-d sampling period. Feed intake, milk yield, milk fat yield, and milk fat percentage were not affected by treatment. Adding solin, flax, or canola oilseed to lactation diets produced the highest proportions of linoleic (C_18:2), linolenic (C_18:3), and oleic (C_18:1) acids, respectively, in the lipid fraction of the milk of the cows consuming these diets. The proportions of C_6:0 to C_16:1 were depressed in the milk fat of cows fed the oilseed diets, compared with the control diet. Increasing the lactation diet levels of C_18:2, by using different oilseeds, increased CLA to 1.5% of milk fatty acids. The content of CLA in milk fatty acids, however, did not increase with the solin-supplemented diet compared with the canola-supplemented diet even though the C_18:2 level was higher in the former diet.

Key Words: fatty acids • milk • conjugated linoleic acid • oilseed

Submitted on June 18, 2001
Accepted on December 13, 2001

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