Feed-grade animal fats consist of rendered fats from beef or pork by-products, which are mainly slaughterhouse offal or supermarket trimmings from the packaging of meats, and poultry fat includes fats from 100% poultry offal. Some fats are also produced from inedible tissues by rendering plants. Choice white grease is primarily rendered pork fat, but it can be a blend of animal fats. In addition to fats of animal origin, restaurant greases which can be mixtures of various animal fats and vegetable oils are being recycled and used for food animal production.
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