A method for increasing the levels of omega-3 fatty acids (“omega-3s”), particularly docosahexaenoic acid (DHA) and eicosapentaenoic/icosapentaenoic acid (EPA), in beef products by feeding cattle a diet containing grass as the primary ingredient supplemented with whole algae high in omega-3s. A method of increasing the levels of omega-3s in beef comprising feeding beef animals a daily food ration comprising grass and whole algae.