Abstract
Rapeseed meal (RSM) and wheat dried distillers grains with solubles (DDGS) are byproducts which may be incorporated into pig diets. However, in comparison with wheat and soyabean meal, higher non-starch polysaccharide (NSP) content in RSM and DDGS may impose dietary limitations. Two 2 × 2 factorial experiments were conducted to investigate the interaction between xylanase (0 vs. 200 mg/kg) and protease (0 vs. 200 mg/kg) enzyme supplementation on (1) growth performance and carcass characteristics, and (2) apparent ileal (AID) and total tract nutrient digestibility (ATTD), manure gaseous emissions in grower–finisher pigs. In experiment 1, to assess growth performance, 128 pigs (body weight (BW), 34.2 ± 2.1 kg; n = 32) were allocated to one of four treatments based on a basal diet containing DDGS (300 g/kg) and RSM (210 g/kg): (1) basal diet; (2) basal diet plus 200 mg/kg protease enzyme; (3) basal diet plus 200 mg/kg xylanase enzyme; (4) basal diet plus 200 mg/kg protease and 200 mg/kg xylanase enzymes. In experiment 1, pigs offered diets supplemented with protease had a lower ADG (P