Effect of wheat middling and multiple enzyme products on growth performance and carcass characteristics in nursery and finisher pigs

Abstract Text: Nursery (Exp. 1; n = 288) and Grower (Exp. 2; n = 216) pigs, with an average BW of 6.39 ± 0.43 and 21.9 ± 0.8 kg) were blocked by initial BW, and assigned to sex-balanced pens. Pens within a block were assigned randomly to 1 of 4 treatments with two basal diets (corn-SBM [CSBM] vs. corn-SBM-wheat middling [CSWM] with or without supplemental multiple enzyme products (MEP). Dietary ME was greater in CSBM than CSWM diets (3.44 vs. 3.42, 3.32 vs. 3.28, and 3.33 vs. 3.27 kcal/kg for nursery phases [NP] 1, 2, and 3, respectively, 3.34 vs. 3.28 kcal/kg for grower phases [GP] 1 and 2, and 3.35 vs. 3.29 kcal/kg for finisher phases [FP] 1, 2, and 3), whereas dietary fat and SID lysine were constant within feeding phase. MEP [Roxazyme G2G (0.011 %) + Ronozyme VP (0.017 %) in NP; Ronozyme WX(0.017 %) + Ronozyme VP (0.011 %) in G; Ronozyme WX (0.028 %) + Ronozyme A (0.028 %) in F] were added at expense of corn. In NP-1, ADG and ADFI were 14% and 12% greater (P < 0.02) in CSWM- than CSBM-fed pigs, whereas feeding nursery pigs MEP increased ADG and ADFI by 11% and 8% (P = 0.06). MEP improved G:F (12.5 %) in CSBM-fed pigs, but not in CSWM-fed pigs (MEP × base-diet, P = 0.05). Conversely, MEP decreased ADG in CSBM-fed pigs, and increased ADG in CSWM-fed pigs during NP-3 (MEP × base-diet, P < 0.04), whereas ADG was less (P < 0.05) in CSWM-fed than CSBM-fed pigs during the GP. Supplemental MEP mitigated the effect of the CSWM diet on ADG during the FP (MEP × base-diet, P ≤ 0.05), but ADFI and G:F were similar among treatments during the FP. Feeding CSWM-based diets reduced (P < 0.05) dressing percent by 1.5 %, whereas MEP increased (P < 0.10) dressing percent by 0.7%. Also, MEP reduced (P <0.02) fat depth by 8 %, and tended to increase (P < 0.10) carcass lean by 2 %. Lastly, MEP improved LM depth 4.3 % in CSWM-fed pigs, but did not affect LM depth of CSBM-fed pigs (MEP × base-diet, P< 0.10). Thus, supplemental MEP tended to mitigate the negative effect of high dietary levels of wheat middling on ADG during the NP and FP, but minimally affected the performance and carcass traits of CSBM-fed pigs. 

Keywords: wheat middling, multiple enzyme products, pigs.