Evaluation of extruded or unextruded double-low rapeseed meal and multienzymes preparation in pigs nutrition during the finishing phase of production

The aim of this study was to compare the effects of extruded or non-extruded double-low rapeseed meal (DL-RSM) and multienzyme preparation on performance, nutrient digestibility, immune function and antioxidant status of the finishing pigs. Forty-eight pigs (Duroc×Landrace×Yorkshire) with an average weight of 62 kg were randomly divided into four groups with three replicates according to gender. Four diets were formulated to meet NRC (1998) nutrient requirements. Diet 1, based on the corn and soybean meal (SBM), was used as control. Diet 2 used 13% DL-RSM instead of the 11% SBM used in the Diet 1. Diet 3 used 13% extruded double-low rapeseed meal (E-DL-RSM) instead of 11% SBM, and Diet 4 0.03% multienzyme preparation was supplemented in Diet 3. The results showed that replacement of 11% SBM by 13% DL-RSM had no negative effects on performance and nutrient digestibility for finishing pigs. Extrusion and multienzyme preparation also had no beneficial effects on pig performance. However, the concentration of immunoglobulin G (IgG) in serum of DL-RSM treatment was lower (P<0.05) than that of the control, but it increased to the level of control in the treatment of extrusion combined with multienzyme preparation. The diet containing E-DL-RSM combined with multienzyme preparation significantly decreased the malondialdehyde (MDA) content (P