This experiment was conducted to study the effects of the different grinding particle sizes of corn on the processing quality of pellet feed and growth performance of finishing pigs under the same formula. Six different aperture sizes (1.5/2.0, 2.0/2.0, 2.0/2.5, 2.5/2.5, 2.5/3.0 and 3.0/3.0 mm) of screen surfaces were used to crush the corn for obtaining corn raw material with the geometric average particle size of 303.91, 346.08, 356.81, 358.51, 373.29 and 387.70 μm, respectively, and the diets with different grinding particle sizes of corn were prepared under the same formula and the same processing parameters (aperture size of screen surface for grinding other ingredients was 2.0 mm, die diameter was 3.0 mm, the length diameter was 9:1, and modulating temperature was 80℃). Then one hundred and eight finishing pigs were randomly allocated into 6 groups with 3 replicates per group and 6 pigs (male: female was 1:1) in each replicate. The pigs were fed with the corn of different grinding particle sizes for eight weeks. The results showed that the grinding energy consumption was reduced from 9.02 to 6.86 kW·h/t, and the pelletizing energy consumption was increased from 19.06 to 22.30 kW·h/t with the particle size increasing. In vitro crude protein digestibility presented ascendant trend with the increase of the granularity of corn, which in 2.5/2.5 mm group was the highest and significantly higher than that in 1.5/2.0 mm group (P<0.05). Hardness of 2.5/3.0 and 3.0/3.0 mm groups was significantly higher than that of the other groups (P<0.05). With the increase of particle size, the apparent digestibility of dry matter was reduced, which in 1.5/2.0 and 3.0/3.0 mm groups were 84.43% and 80.62%, respectively, and the latter was 4.5% lower than the former (P<0.05). With the increase of particle size, the apparent digestibility of crude protein presented the downward trend overall, which in 1.5/2.0 mm group was 86.14%, and with a significant difference compared with the other groups (P<0.05). Average daily gain and the ratio of feed to gain were not significant difference among all groups (P>0.05), and the highest average daily feed intake was in 2.5/2.5 mm group, but there was no significant difference among groups either (P>0.05). According to the results of our experiment, screen surface with 2.5/2.5 mm aperture size is recommended for grinding corn in diet of finishing pigs.
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