Ruminants -- cows, sheep, goats, and buffalo -- are described as grass fed or grass finished. The U. S.
Department of Agriculture (USDA) has not yet come to a formal definition of either grass fed or grass finished, but generally speaking, grass-fed beef means the cattle ate only grass or forage most of their lives. These animals may have been "finished" on grain, which means they were fed grain in the last 90 to 160 days of their lives. Grass finished, on the other hand, is a more specific term meaning that the cattle were fed grass throughout the entire course of their lives, even in the finishing stage (the last 90 to 160 days).
Because there is no formal definition, many people use these two terms interchangeably, but ideally you want to find beef that was grass finished. An important point is that if an animal is grass fed or grass finished, this doesn't necessarily mean it's organic. But it's a rare thing to find a farmer raising grass-fed or grass-finished cattle also using pesticides and growth hormones.
Generally speaking, when it comes to ruminants, grass fed or finished is the gold standard in terms of nutritional value, animal welfare, and environmental sustainability.
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