PSV-18 Effects of Replacing Lactose with Novel Carbohydrate Sources on Nursery Pig Growth Performance

Abstract

Abstract This experiment was conducted to determine the effects of replacing lactose in Phase 1 and 2 nursery diets with 1 of 2 novel carbohydrate (CHO) products (CHO-D and CHO-L; Cargill Starches, Sweeteners, & Texturizers, Blair, Nebraska) on growth performance and fecal dry matter. A total of 360 barrows (DNA 200×400; initially 6.0 ± 0.04 kg) were used in a 42-d growth trial. Pigs were weaned at approximately 21 d of age, randomly allotted to pens in 1 of 2 body weight (BW) blocks based on initial BW (initially 5.4 and 6.6 kg), and then allotted to 1 of 6 dietary treatments in completely randomized design, with 5 pigs/pen and 12 replications across 2 barns. Dietary treatments were corn-soybean meal- based with 5 to 7.5% DDGS and included: 1) negative control (NC; containing 0.08 and 0.04% lactose, phase 1 and 2, respectively); 2) positive control (PC; containing 10 and 5% lactose, phase 1 and 2, respectively); 3) 50% of lactose replaced with the dry novel CHO (50% CHO-D; containing 5 and 2.5% lactose, phase 1 and 2, respectively); 4) 100% of lactose replaced with CHO-D (100% CHO-D; containing 0.09 and 0.05% lactose, phase 1 and 2 respectively); 5) 50% of lactose replaced with the liquid novel CHO (50% CHO-L; containing 5 and 2.5% lactose, phase 1 and 2, respectively); or 6) 100% of lactose replaced with CHO-L (100% CHO-L; containing 0.09 and 0.05% lactose, phase 1 and 2 respectively). Novel CHO sources (CHO-D or CHO-L) replaced whey powder on a carbohydrate basis in Phase 1 and 2 diets. Treatment diets were formulated in two phases fed from d 0 to 10 and d 10 to 24, respectively, with a common phase 3 diet fed until d 42. There was a tendency for an effect of CHO source (P = 0.058) on G:F during the treatment period, in which pigs fed the NC diet had the highest numeric G:F and pigs fed the 100% CHO-L diet had the least numeric G:F (Table 1). Overall, there was no observed effect of CHO source (P > 0.100) on ADG, ADFI, or fecal dry matter. In summary, feeding either of the novel CHO sources did not significantly affect growth performance or fecal dry matter during the nursery period compared with those pigs fed a traditional lactose source or a diet that did not contain any lactose. Based on the results herein, pigs fed diets containing either novel CHO product had equivalent performance to those on the PC treatment, but we were unable to detect incremental value as the PC treatment did not significantly differ from the NC treatment.