There are different grain size requirements for different feeding objects and different feeding stages, and this requirement is quite different. In the feed processing process, the animal must first meet the basic requirements for particle size, in addition to other indicators.
1. Suitable crushing size of pig feed
1) Piglet feed crushing particle size: The results of various studies show that the crushing particle size of the grain raw material in piglet feed is preferably 300-500. Among them, weaned piglets are 0 to 14 days after weaning, and 300 is appropriate. It is preferred to use 500 after 15 days after weaning.
2) Crushing particle size of fattening pig feed: Feed test shows that the grain size reduction will improve body weight gain and feed conversion rate, but in small particle size, pig gastrointestinal damage and keratinization will occur. Tests have shown that the suitable crushing size of growing and finishing pigs is between 600 and 500. Feeding fattening pigs after granulation with a small-sized feed reduced the dry matter in the manure by 27%.
3) The pulverized particle size of the sow feed, the appropriate pulverization particle size can also increase the feed intake and nutrient digestibility of the sow, and reduce the discharge of the sow feces. A large number of tests have shown that the smashing size of the sow feed is 400-500. Most suitable.
2, chicken feed crushing particle size requirements
Through a large number of comprehensive research results, the weight gain of chicken feeding small-grained feed is significantly higher than that of eating large-grain. The crushed grain size of the grain in the broiler feed is preferably from 700 to 900. Laying hens are not sensitive to the comminution of feed, and are generally controlled at 1000.
3, fish and shrimp feed on the crushing particle size requirements
The particle size of the fish-fed feed recommended by the NRC (1993) fish nutrition requirement standard should be less than or equal to 0.5 mm. Generally, the pulverization requirements of the raw materials for the compound feed for fish are all passed through a 40-mesh sieve (0.425 mm sieve hole), and the 60-mesh sieve (0.250 mm sieve) has a sieve content of not more than 20%. The logarithmic geometric mean particle size of the fish feed should be below 200. China's aquatic product standards (SC2002-94) for the Chinese shrimp professional feed crushing particle size requirements are all through the 40 mesh sieve (0.425mm mesh), 60 mesh sieve (0.250mm mesh) sieve on the sieve is not more than 20%, the particle size in 200 or less. The requirements for squid and turtle feed are very fine. Generally, the larvae and juveniles require 98% of the 100 mesh sieves, and the average particle size is less than 100. The mash and the mash feeds are generally controlled by 98% of the 80 mesh sieve. The diameter is controlled below 150.
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