288 Effect of Increasing Mn from Mn Hydroxychloride on Growth Performance and Carcass Characteristics of Grow-Finish Pigs

Abstract

Abstract A total of 2,025 grow-finish pigs (337 × 1050, PIC; initially 39.9 ± 0.55 kg) were used in a 95-day trial to determine the impact on growth and carcass performance by increasing Mn from Mn hydroxychloride compared with a control diet containing MnSO4. Pigs were housed in mixed gender pens with 27 pigs per pen and 15 pens per treatment. The treatments were structured as a completely randomized design and consisted of a control diet containing 30 mg/kg of Mn from MnSO4 (Eurochem, Veracruz, Mexico) or 15, 30, 45 or 65 mg/kg of Mn from Mn hydroxychloride (IBM; IntelliBond M, Micronutrients USA, LLC, Indianapolis, IN). Experimental diets were corn-soybean meal-DDGS-based and were formulated with a premix without Mn and containing 150 mg/kg of Cu from IntelliBond C (Micronutrients, Indianapolis, IN) and 100 mg/kg of Zn from IntelliBond Z (Micronutrients, Indianapolis, IN). Diets were fed in 4 phases from 39.9 to 49.9, 49.9 to 74.8, 74.8 to 99.8, and 99.8 to 133.3 kg. In the grower period (d 0 to 43), G:F was improved (quadratic, P = 0.035) when IBM level increased up to 45 mg/kg but then worsened thereafter (Table). Overall (d 0 to d 95), there was no evidence of difference (P > 0.05) for any growth or carcass response criteria when comparing the Mn sources at 30 mg/kg of Mn or when increasing the level of IBM in diets. In conclusion, no differences were observed in this trial with the exception of an improvement in G:F observed in the grower phase as Mn from IBM increased up to 45 mg/kg.