Water content and influence of granule feed for Suckling pig 
1.1 Moisture content of Suckling pig pellet feed 
In winter and spring season, due to the low temperature, feed manufacturers use more newly listed corn, its moisture content is relatively high, in feed production after granulation, moisture is about 13%, basically can meet the quality control requirements. But in summer and autumn, the moisture of feed raw materials is 11%~13%, and the temperature is high, the moisture of feed raw materials is lost in the process of crushing, pelleting and pretreatment, making the moisture of feed finished products in 9%~11%. 
1.2 Effect of moisture content of pellet feed on performance of Suckling pigs 
The moisture of granular material is too high, the nutrient concentration is low, and it is easy to mold and deteriorate in the use process. Low moisture content of granular feed will reduce starch gelatinization and digestibility, and grain hardness will affect palatability of Suckling pigs and reduce feed intake. 
1.3 Influence of moisture content of granular material on mechanical wear and production efficiency 
The lower the particle moisture, the more serious the mechanical wear, the lower the production efficiency. Granular material moisture in 11%~13% production efficiency, mechanical wear light. 
1.4 Influence of moisture content of granular materials on economic benefits of enterprises 
The moisture content of granular material not only affects the quality of feed, but also affects the yield and economic benefit of the product. An annual output of 20000 t granular material enterprises, annual loss of economic benefits can be as high as 2 million yuan (according to the annual output of 20000 T, by adjusting the moisture content, increase by 2% per t, per t material selling price of 5000 yuan). The quality of feed and the economic benefit of enterprises can be significantly improved by adjusting the production process parameters according to the different production season climate and the variation of moisture content of raw materials. 
Methods to improve moisture content of granular material in feed processing 
2.1 Moisture control during raw material comminution 
By comparing and analyzing the results of screen production with different aperture crusher, it is found that the water loss of raw material increases obviously with the decrease of grinding particle size of raw material. With the increase of the moisture content of raw materials, the comminution efficiency decreases significantly and energy consumption increases. The moisture loss of raw materials during comminution is generally about 0.5%. 
2.2 Moisture control in feed mixing process 
The water loss during feed mixing is negligible. When the moisture content of the mixed powder is relatively low, it can be considered to spray atomizing water when the material is mixed. However, there are many problems in adding water in the mixer, which must be paid great attention to: (1) The water added to the mixer can not be used directly with tap water, and it needs to be treated with special treatment or added with mildew inhibitor. (2) To configure the number and size of suitable sprinkler head, adjust the position of sprinkler head and spray rate, to ensure uniform spraying. ③ Clean up the mixer and granulating silo after production every day to avoid the residue of materials on the inner wall of the mixer and granulating silo. (4) Real-time monitoring of moisture and weather changes of raw materials and final products, according to the monitoring results to determine the amount of water added when mixing, to ensure that the final product moisture content in a safe range. 
2.3 Moisture control during conditioning and tempering 
Steam quenching and tempering is a key technology in pellet feed processing. The quenching and tempering effect directly affects the quality of pellet and water content of finished product. Steam quality and quenching and tempering time are two important factors affecting the quenching and tempering effect. In the production process by adjusting or closing the trap, the use of low-pressure steam, increase the material in the quenching and tempering time, so that the material and steam fully mixed, can make the material fully absorb the moisture in the steam, thus increasing the moisture of the product. 
2.4 Choose the appropriate pelletizing ring die 
The diameter and compression ratio of the ring die of the pelletizer are the main factors affecting the capacity of the pelletizer, and also one of the factors affecting the moisture content of pellet feed products. For ring die with small aperture, due to its small particle diameter, the cooling air volume of cooler is easy to penetrate the feed particles, so the water taken away when cooling will be more, and the moisture of feed products will be low. On the contrary, the aperture of the material ring mold, the particle diameter is larger, cold wind is not easy to penetrate the particles, cooling away less water, feed product moisture will increase. For the large compression of the ring die, in the pelleting process, friction resistance is large, the material is not easy to pass through the aperture, extrusion extrusion grain, high friction temperature, water loss, the feed particle moisture will be reduced. Generally, Suckling pig feed uses ring die with relatively small pore diameter, so selecting ring die with low compression ratio is beneficial to improve the quality and moisture content of granular feed. 
2.5 When granular materials are cooled, appropriate cooling air volume should be selected 
The purpose of cooling process is to reduce the temperature of pellet feed, so that it does not exceed 3℃ at room temperature; Can also take away the moisture in the feed, so that the moisture of the feed products meet the requirements of the provisions, according to the water before the cooling of the finished product, set the cooling parameters of the finished product, to avoid excessive water loss.