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Summaryexperiments were conducted to evaluate the effects of soybean hulls in diets with and without corn dried distillers grains with solubles (DDGS) on nursery pig growth performance. In Exp. 1, a total of 600 pigs (PIC C-29 × 359, initially 14.7 lb) were used in a 42-d growth study. Diets contained increasing amounts of soybean hulls (0, 3, 6, 9, or 12%) in either corn-soybean meal or corn-soybean meal-DDGS–based diets (15 and 30% DDGS for Phases 1 and 2, respectively). Pigs were blocked by initial pen weight, gender, and room location, with 10 pigs per pen and 6 replications per treatment. Overall (d 0 to 42), soybean hulls × DDGS interactions (quadratic, P < 0.05) were observed for F/G and caloric efficiency on an ME and NE basis. Increasing soybean hulls wors ened F/G quadratically (P < 0.03) when added to diets without DDGS but linearly (P < 0.01) when added to diets with DDGS. Caloric efficiencies improved on an ME and NE basis (quadratic, P < 0.04) with increasing soybean hulls in diets without DDGS but did not influence caloric efficiency when added to diets containing DDGS. Adding DDGS to the diet decreased (P < 0.04) ADG and ADFI but tended to improve (P < 0.06) F/G. Adding soybean hulls to diets containing DDGS further reduced (quadratic, P < 0.05) ADG and tended to reduce (quadratic, P < 0.08) ADFI, whereas adding soybean hulls to diets without DDGS had no effect on ADG or ADFI. In Exp. 2, 304 pigs (PIC, 337 × 1050, initially 25.7 lb) were used in a 21-d study. The 8 diets were arranged in a 2 × 4 factorial with increasing soybean hulls (0, 5, 10, or 15%) in either corn-soybean meal or corn-soybean meal-DDGS–based diets (20% DDGS). Pigs were balanced by initial BW and randomly allotted to 1 of 8 dietary treatments with 9 replications per treatment. Overall (d 0 to 21), no soybean hull × DDGS interactions were observed. Increasing soybean hulls tended to worsen (linear, P < 0.07) F/G but improved (linear, P < 0.008) caloric efficiency on an ME and NE basis. In contrast to the first experiment, the greatest negative effect on F/G (linear, P < 0.04) came from adding soybean hulls to diets without DDGS. Adding DDGS to the diets had no effect on growth performance. These data indicate that feeding up to 15% soybean hulls in diets for nursery pigs does not affect growth rate or feed intake, but worsens F/G and improves caloric efficiency.

The effects of soybean hulls in corn-soybean meal and corn-soybean meal-dried distillers grains with solubles diets on nursery pig performance