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Cows fed with flaxseed produce more nutritious milk

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Cows fed with flaxseed produce more nutritious milk

January 24
14:29 2013

Dairy cows that are fed flaxseed produce more nutritious milk, according to a new study by Oregon State University.

Their milk contained more omega-3 fatty acids and less saturated fat, the study found.

Traditional cattle feed mixtures of corn, grains, alfalfa hay and grass silage result in dairy products with low concentrations of omega-3 and other polyunsaturated fats, according to Gerd Bobe, the lead scientist on the study, which has been published online in the Journal of Dairy Science.

Ten pregnant cows at OSU’s dairy were fed different amounts of flaxseed – up to 7% of their daily diet. Researchers attempted to pinpoint the amount of flaxseed that would maximize the amount of omega-3 in milk and dairy products without negatively affecting their production and texture.

“We were looking for a sweet spot,” said Bobe. “Too much of a good thing can be bad, especially when trying to maintain consistency with dairy products.”

Collaborators in OSU’s food science and technology department assisted in turning milk into butter and fresh cheese, which were then tested for texture and nutritional composition.

The study found that feeding cows up to 6 lb. of extruded flaxseed improved the fat profile without negatively affecting the production and texture of the milk and other dairy products. Extrusion presses raw ground flaxseed into pellets with heat.

At 6 lb. per day, saturated fatty acids in whole milk fat dropped 18%, poly-unsaturated fatty acids increased 82%, and omega-3 levels rose 70% compared to feeding no flaxseed. Similar improvements were observed in butter and cheese.

Still, saturated fat accounted for more than half of the fatty acids in the dairy products while the increase in polyunsaturated fats compromised no more than nearly 9% of the total.

Researchers also noted that the refrigerated butter was softer and less adhesive thanks to fewer saturated fatty acids. Also, the cows produced the same amount of milk while eating flaxseed.

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