Name: Challenges in enriching milk fat with polyunsaturated fatty acids

Authors: Jennifer Stamey Lanier1 and Benjamin A. Corl2*

Address: *Department of Animal and Veterinary Science, University of Idaho, Moscow 83844†Arm & Hammer Animal Nutrition Group, Church & Dwight Co. Inc., Princeton, NJ 08543

Abstract: Milk fatty acid composition is determined by several factors including diet. The milk fatty acid profile of dairy cows is low in polyunsaturated fatty acids, especially those of the n-3 series. Efforts to change and influence fatty acid
profile with longer chain polyunsaturated fatty acids have proven challenging. Several barriers prevent easy transfer of dietary polyunsaturated fatty acids to milk fat including rumen bio hydrogenation and fatty acid esterification. The
potential for cellular uptake and differences in fatty acid incorporation into milk fat might also have an effect, though this has received less research effort. Given physiological impediments to enriching milk fat with polyunsaturated fatty
acids, manipulating the genome of the cow might provide a greater increase than diet alone, but this too may be challenged by the physiology of the cow

Key Words: : Dairy cow, Milk fat, Polyunsaturated fatty acids

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