One way that menhaden oil benefits animals is with chickens. When menhaden oil was given to chickens in their feed, they have a lower chance of fatty liver disease. This was because of menhaden oil’s high omega-3 fatty acid content which took the place of omega-6 fatty acid which is not as beneficial to animals. Another animal the benefits from omega-3 in menhaden oil is guinea pigs. When given menhaden oil in feed guinea pigs were shown to have a longer life span.