2TPH Fish Feed Mill Plant Setup Cost - bestpelletplant.com How to determine the compression ratio if I do chicken feed? It depends on the customer's raw material recipe, usually do chicken feed using 3mm or 4mm aperture ring die, 32 ring die machine grinder recommended so configuration: 3mm - 1:6.5, 1:7 each; 4mm - 1:7, 1:8 each It basically