PSIX-4 Concentrations of digestible and metabolizable energy and digestibility of phosphorus in a new source of high-protein distillers dried grains with solubles fed to growing pigs

Abstract

Abstract Concentrations of digestible and metabolizable energy and digestibility of phosphorus in a new source of high-protein distillers dried grains with solubles fed to growing pigs Minoy Cristobal, Su A Lee, and Hans H. Stein The objective of this research was to test the hypothesis that concentrations of DE and ME and standardized total tract digestibility (STTD) of P in high-protein distillers dried grains with solubles (HP-DDGS) are greater than in conventional distillers dried grains with solubles (DDGS-CV). In Exp. 1, twenty-four growing barrows (initial BW: 32.7 ± 3.1 kg) were fed a corn diet or 2 diets containing corn and HP-DDGS or corn and DDGS-CV. The statistical model included ingredient as a fixed effects and replicate as the random effect and the pig was the experimental unit. Results from Exp. 1 indicated that the concentrations of DE and ME of HP-DDGS were greater (P < 0.05) compared with DDGS-CV (Table 1). In Exp. 2, thirty-two growing barrows (initial BW: 20.2 ± 0.9 kg) were allotted to 4 diets with 8 pigs per diet. The DDGS-CV or HP-DDGS were included in a diet without microbial phytase and in a diet with microbial phytase (500 units/kg diet). The statistical model included ingredient, phytase, and the interaction as fixed effects and replicate as the random effect. Results from Exp. 2 indicated that inclusion of phytase in the diet containing HP-DDGS increased (P < 0.05) the STTD of P, but addition of phytase to the DDGS-CV diet did not increase STTD of P (interaction, P < 0.001; Table 2). The value for the STTD of P was greater (P < 0.05) in DDGS-CV compared with HP-DDGS. In conclusion, HP-DDGS has greater concentrations of DE and ME, but less STTD of P compared with DDGS-CV.