For the same solid-liquid separation machine, the easier the separation, the higher the crude fiber content in the feces. Therefore, among cow dung, pig dung, and chicken dung, separation is better for cow and pig dung. Chicken dung is difficult to separate due to its fineness and stickiness. Similarly, sow dung is more difficult to separate than fattening pigs, which are the same as young pigs, as the feces they produce is difficult to separate. For this reason, choosing an inclined screen solid-liquid separator or a drum screen solid-liquid separator is more appropriate!