In general, the finer the mineral element pre-mixed additives are, the more homogeneous the mixing, the better the feeding effect. After the protein feed is crushed, it can increase the contact surface between the feed and the digestive juice of the livestock and poultry, and can improve the digestibility of the feed. However, it should not be crushed too finely so as to prevent the chewing of livestock and poultry from being adequate, and the uneven mixing of saliva would impede digestion. The fineness of the feed should vary depending on the type of livestock and poultry. The chicken's feed should not be too fine, because the chicken likes to eat pellets or broken cereals, can be used with the thickness. Rice and broken rice can be directly added to the mixer in the form of pellets. The crushed fineness of wheat and barley should be less than 2.5 mm, and corn, brown rice and soybean cake should be processed into powdery material. When laying hens produce soft shell eggs that require calcium supplementation, it is desirable to feed granules of calcium, that is, to grind limestone, shells, etc. into sorghum grain-sized granules that are fed at the end of the evening when they are fed. Because of the longer time for granular calcium to stay in the chicken body, it is beneficial to the absorption and utilization of chicken body, so the effect of calcium supplementation is good. Sub-pigs are preferably made of specially formulated pelleted feed or chopped feed. Legumes and other energy feeds can be fried and fed. Piglets weighing 25 kg or less can feed general piglets; pigs weighing more than 25 kg can feed. Fineness can be controlled within 2 mm. The fineness of the fine feed of cattle and sheep can exceed 2mm, because cattle and sheep can be ruminated, and a little bit of feed is conducive to rumination and improve the digestibility of feed. The crushed fineness of old cattle and sheep's feed can be within 1 millimeter to facilitate digestion. While considering the type of livestock and poultry, the fineness of the feed must also be taken into consideration not to make the fat-rich cereal feed, such as corn and oats, rancid and deteriorated due to fine grinding and long storage time.

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