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    Ingredients for Dairy ProcessorsCase Studies

    Ingredients

    OSU study: Cows fed flaxseed produce more nutritious dairy products

    OSU researcher Gerd Bobe
    February 1, 2013

    By Daniel Robison

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

    OSU researcher Gerd Bobe
    OSU researcher Gerd Bobe led a study that fed flaxseed to dairy cows and examined the effects to milk, cheese and butter. Photo by Hannah O'Leary

    Their milk contained more omega-3 fatty acids and less saturated fat, the study found. Diets high in saturated fat can increase cholesterol and cause heart disease, while those rich in omega-3 and other polyunsaturated fatty acids may reduce the risk of heart disease, studies have shown.

    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 seven percent 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, an expert in human and animal nutrition. “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 six pounds 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.

    OSU Study Cows fed Flaxseed
    Dairy cows fed up to 7% of their daily diet (about six pounds) produced milk with lower amounts of saturated fat and higher concentrations of Omega-3 fatty acids. Photo by Lynn Ketchum

    At six pounds per day, saturated fatty acids in whole milk fat dropped 18 percent, poly-unsaturated fatty acids increased 82 percent, and omega-3 levels rose 70 percent 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 nine percent 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. Although flaxseed costs more than traditional cattle feeds, Bobe hopes that it still could be an affordable feed supplement for cows because products enriched with omega-3 can sell for a premium at the grocery store.

    "Many consumers already show a willingness to pay extra for value-added foods, like omega-3 enriched milk," he said.

    One thing is for sure, he said: Dairy farmers will have no trouble convincing cows to eat flaxseed. "They loved it. They ate it like candy," he said.

    About Oregon State University:
    OSU is one of only two U.S. universities designated a land-, sea-, space- and sun-grant institution. OSU is also Oregon’s only university to hold both the Carnegie Foundation’s top designation for research institutions and its prestigious Community Engagement classification. Its approximately 26,000-plus students come from all 50 states and more than 90 nations.

    Source: Gerd Bobe, OSU researcher
     

    KEYWORDS: flaxseed ingredient news ingredients for dairy processors omega 3 omegas Omegas/ Lipids

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