Disclosed herein is a method for feeding low doses of algae to cattle to increase the level of omega 3 polyunsaturated fatty acids including docosahexaenoic acid (DHA) and eicosapentenoic acid (EPA) in commercial cattle feeding environments. The method of increasing the level of omega-3 fatty acids in cattle which comprises feeding the cattle between about 0.05 and 0.8 pounds per day of algae.