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Grain source and processing in diets containing varying concentrations of wet corn gluten feed for finishing cattle

, : Grain source and processing in diets containing varying concentrations of wet corn gluten feed for finishing cattle. Journal of Animal Science 84(4): 986-996

Two experiments were conducted to evaluate combinations of wet corn gluten feed (WCGF) and barley, as well as the particle size of dry-rolled barley and corn, in finishing steer diets containing WCGF. In Exp. 1, 144 crossbred steers (initial BW = 298.9 +/- 1.4 kg) were used to evaluate barley (0.566 kg/L and 23.5% NDF for whole barley) and WCGF combinations in finishing diets containing 0, 17, 35, 52, or 69% WCGF (DM basis), replacing barley and concentrated separator byproduct. A sixth treatment consisted of corn (0.726 kg/L and 11.1% NDF for whole corn), replacing barley in the 35% WCGF treatment. In Exp. 2, 144 crossbred steers (initial BW = 315.0 +/- 1.5 kg) were used to evaluate coarse or fine, dry-rolled barley or corn (0.632 and 0.699 kg/L; 26.6 and 15.9% NDF for whole barley and corn, respectively) in finishing diets containing WCGF. A factorial treatment design was used; the factors were grain source (corn or barley) and degree of processing (coarse or fine). The diets contained 50% WCGF, 42% grain (corn or barley), 5% alfalfa hay, and 3% supplement (DM basis). In Exp. 1, DMI and ADG responded quadratically (P < or = 0.03), peaking at 35 and 52% WCGF, respectively. The efficiency of gain was not affected (P > or = 0.42) by dietary treatment. Steers fed dry-rolled corn and 35% WCGF had heavier HCW, lower DMI, greater ADG, increased G:F, increased s.c. fat thickness at the 12th rib, and greater yield grades compared with steers fed dry-rolled barley and 35% WCGF (P < or = 0.04). The apparent dietary NEg was similar among the barley and WCGF combinations (P > or = 0.51); however, the corn and 35% WCGF diet was 25% more energy dense (P < 0.001) than was the barley and 35% WCGF diet. In Exp. 2, no grain x processing interactions (P > or = 0.39) were observed. Particle size was 2.15 and 2.59 mm for fine- and coarse-rolled barley and was 1.90 and 3.23 mm for fine- and coarse-rolled corn. Steers fed a combination of corn and WCGF had increased ADG, greater G:F, heavier HCW, larger LM area, more s.c. fat thickness at the 12th rib, greater yield grades, increased marbling, and more KPH compared with steers fed a combination of barley and WCGF (P < or = 0.03). Fine-rolling of the grain increased fat thickness (P = 0.04). The addition of WCGF to the barley-based diets increased DMI and gain. Decreasing grain particle size did not greatly affect performance of the steers fed the 50% WCGF diets; however, carcasses from the steers fed the fine-rolled grain contained more fat.


PMID: 16543577

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