... The raw materials of meat and bone meal are mainly from by-products of pigs, cattle and ... sheep in slaughterhouse, whose main components are residual bone, skin, fat, offal, meat after ... High energy, high content of protein; 3. Rich in vitamins and potassium, sodium, magnesium, iron, copper, manganese, ... After entrance to the industry, the raw materials are sorting out of the skin, fur, hoof, ...