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Fermenting high fiber ingredients such as distillers dried grains with solubles (DDGS) with feed enzymes may improve their feeding value. Liquid feeding systems provide a favorable environment for the enzymatic digestion. This study aimed to investigate the effects of fermenting corn DDGS with a blend of β-glucanase and xylanases (XB) in a liquid feeding system on growth performance, gut parameters, and apparent total tract digestibility (ATTD) of nutrients and energy in growing pigs. Dietary treatments were: (1) corn soybean meal-based diet + 30% DDGS (control), (2) control + XB without fermentation (XBNS), and (3) control + DDGS fermented with XB (16% DM) for 3 to 10 d at 40 °C (XBS). Diets contained phytase at 750 FTU/kg. A total of 144 pigs (25 ± 1.0 kg BW) were assigned to pens (three barrows and three gilts) and allocated to the three diets in a two-phase feeding program (3 wk/phase). Diets were fed ad libitum and delivered by a computer-controlled liquid feeding system at a feed to water ratio of 1:4, four times per day. Fecal samples were taken in the final 3 d of phase 2 to determine ATTD using TiO2 marker method and one pig per pen was euthanized for gastrointestinal (GIT) measurements. The pH of diets at feeding time was lower for XBS (4.72) compared with control (5.45) and XBNS (5.45).
Pigs fed XBNS had higher ADG than control in phase 1. In phase 2 and the overall (weeks 0 to 6), ADG and final BW were higher for XBNS than XBS but were not different from control. There were no diet effects on ADFI. Feed to gain (FCR) for XBNS (1.68) and XBS pigs (1.69) was better than for control pigs (1.78) in phase 1. There were no diet effects on FCR in phase 2 or in the overall. Pigs fed XBNS had lower ATTD of CP than control and XBS-fed pigs. Although not different from control, pigs fed XBNS had lower jejunal crypt depth and ATTD of gross energy than pigs fed XBS.
In conclusion, treating corn DDGS with XB with or without liquid fermentation improves feed efficiency in phase 1, suggesting degradation of dietary fibrous components that may limit nutrient utilization in younger pigs. However, these benefits were not observed in phase 2.
Rho Y, Wey D, Zhu C, Kiarie E, Moran K, van Heugten E, de Lange CF. Growth performance, gastrointestinal and digestibility responses in growing pigs when fed corn–soybean meal-based diets with corn DDGS treated with fiber degrading enzymes with or without liquid fermentation. Journal of Animal Science. 2018; 96(12): 5188-5197. https://doi.org/10.1093/jas/sky369
