In the process of adding water to the feed machinery mixer, the main attention to such issues: 1, must add atomized water, and add no more than 2% of the material (the actual water retention rate is estimated to be no more than 50%), otherwise it is easy to mold; 2, add liquid mildew agent, but the palatability has a certain impact; 3, pay attention to the residual situation in the mixer and finished product sieve and other equipment, and clean up regularly.