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Changes of digestive enzymes in three groups of weaned piglets. (a) The levels of cellulase activity in three groups. (b) The level of chymotrypsin activity in the three groups. (c) The level of amylase activity in the three groups. (d) The level of protease activity in the three groups. (e) The level of trypsin activity in the three groups. (f) The level of lactase activity in the three groups. Repeated five times for each group (n = 5). (*, P < 0.05; **, P < 0.01).
