The paper reviewed the development of technology and equipment of liquid addition. The advantages and shortcomings of liquid coating were analyzed. If liquid ingredients were added after heat processing, such as feed conditioning, extruding, expanding and pelleting, the loss of heat-sensitive components can be reduced. However, in the traditional liquid coating system, most of the liquid ingredients are coated onto the surface of pellets, some feedstuff fall off the pellets to form powder durin...
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