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The Effect of β-mannanase and a β-glucanase Combined with β-mannanase in Corn-Soybean Meal-DDGS Diets on Grower Pig Growth, Feed Intake and Feed Efficiency Performance in a Commercial Setting
Nine-hundred fifty five pigs (initial BW= 26.08, SEM 0.14kg; 66d age) were used to evaluate the effect of β-mannanase (Hemicell®: HM) and β-glucanase plus β-mannanase (Zymannase®: Zym) enzymes in a corn-soybean meal-dried distillers grains with soluble (DDGS) diet on grower pig performance. Pigs were allocated in a randomized complete block design into mixed gender pens, with 11 replicates per treatment, 22 pigs per pen. Pigs were fed 3 dietary phases, Phase 1 (d0-21), Phase 2 (d21-42), and Phase 3 (d42-72). Dietary treatments were: T1, Positive Control (3450, 3436, and 3435 kcal/kg ME; by phase, respectively); T2, Negative Control (3333, 3320, and 3319 kcal/kg ME; by phase, respectively); T3, T2+HM (0.10 MU/kg mannanase); T4, T2+ZYM (0.08 MU/kg glucanase, 0.10 MU/kg mannanase). Diets contained 20, 30, and 30% corn DDGS by phase, respectively. Individual weights were recorded on d0 and pen BW and feed disappearance were recorded on d21, 42, and 72. Data were analyzed using GLM procedure in SAS. For Phase 1 ADG, G:F and BW improved (P<0.05) for T1 versus all other treatments. Phase 2 ADFI increased (P<0.05) for T2 and T4 versus T1 (1896, 1996, 1946, 1996 g/d, T1-T4, respectively) with G:F being numerically improved (P=0.12) for T1 and T3 versus T2 and T4 (0.442, 0.438, 0.452, 0.425 T1-T4, respectively). There were no differences for Phase 3 ADG amongst treatments (P=0.75). ADFI was numerically different (P=0.11) for T2 versus all other treatments (2273, 2381, 2282, 2273 g/d, T1-T4, respectively). G:F increased (P<0.05) for T1, T3, and T4 versus T2 (0.417, 0.395, 0.412, 0.420 T1-T4, respectively). Overall there was no difference to ADG (P=0.14) or final BW (P=0.34) among treatments. ADFI increased (P<0.05) for T2 versus T1 and T3, while T4 was intermediate. G:F improved (P<0.05) for T1 versus T2, while T3 and T4 were intermediate (0.459, 0.435, 0.448, 0.443 T1-T4, respectively). While performance to exogenous enzyme application of Hemicell® and Zymannase® in the d21 to d72 period is promising, additional work is needed to understand implementation and the induction period due to the lack of response for the first 21 days.
Keywords: swine, Hemicell®, Zymannase®