Effect of insoluble-low fermentable fiber from corn-ethanol distillation origin on energy, fiber, and amino acid digestibility, hindgut degradability of fiber, and growth performance of pigs1

Abstract

Extensive use of corn coproducts in swine diets increases the concentration of dietary fiber, raising concerns on energy and nutrient digestibility and, ultimately, pig performance. A digestion trial was conducted to determine the effect of increasing levels of insoluble-low fermentable fiber from corn in the diet, using corn bran with solubles (CBS) from the corn-ethanol distillation industry, on digestibility of energy, fiber, and AA, and hindgut fermentation of fiber in diets fed to growing pigs. Fifteen growing pigs (BW=28.7 kg) arranged in a 3-period incomplete block design and fitted with a T-cannula in the distal ileum were provided 5 diets (n=9) containing either a corn-casein basal or the basal diet with 10, 20, 30, or 40% CBS. Fecal and ileal digesta samples were collected. Two subsequent 28-d growth trials determined the effects of increasing dietary fiber from CBS in 2 sets of 7 diets formulated either with declining (growing phase: 2,387 to 2,133 kcal NE/kg; finishing phase: 2,499 to 2,209 kcal NE/kg) or constant dietary NE (growing phase≈2,390 kcal NE/kg; finishing phase≈2,500 kcal NE/kg) on growth performance and apparent total tract digestibility (ATTD) of energy in 70 growing (BW=48.9 kg; n=10 per diet) and 70 finishing (BW=102.0 kg; n=10) pigs. Results indicated that increasing fiber from corn lowered (P<0.01) the apparent ileal digestibility of all indispensable amino acids except Arg, GE, DM, and CP but not NDF or total dietary fiber (TDF). Increased fiber from corn also reduced ATTD of GE, DM, CP, NDF, and TDF (P<0.01). Increasing fiber with declining diet NE lowered BW, ADG, and G:F (P<0.05) in growing and in finishing pigs. When NE was held constant, as fiber increased, BW and ADG were unaffected in growing and finishing pigs, and G:F was unaffected in finishing pigs but improved in growing pigs (P<0.05) with increasing dietary fiber. In both growing and finishing pigs, ADFI was unaffected by the increased fiber from corn, regardless of the NE content of diets. In conclusion, the dietary level of insoluble-low fermentable dietary fiber from corn origin decreased the digestibility of dietary AA, and the ability of the growing pig to ferment corn dietary fiber. In spite of the reduction in digestibility of energy and nutrients with insoluble-low fermentable fiber level from corn, growth performance was not impaired when the energy supply is adequately balanced in the diet using the NE system.

Narasin effects on energy, nutrient, and fiber digestibility in corn-soybean meal or corn-soybean meal-dried distillers grains with solubles diets fed to 16-, 92-, and 141-kg pigs

“…In the current experiments, feeding DDGS affected performance only in the young pig and generally decreased ATTD of energy and many of the nutrients measured. Our data are supported with previously published data sets on the impact of feeding DDGS on ATTD of energy and nutrients and growth performance in pigs, which has been discussed extensively elsewhere (Stein and Shurson, 2009;Cromwell et al, 2011;Gutierrez et al, 2013Gutierrez et al, , 2014aKerr et al, , 2015aWu et al 2016a,b,c), and was not one of the main objectives of the current experiment.…”

Digestibility of crude protein and amino acids in corn grains from different origins for pigs

“…Dietary fats (Cervantes-Pahm and Stein, 2008;Kil and Stein, 2011) and fibers (Gutierrez et al, 2013) have been reported to influence AA digestibility values. In the present work, however, we failed to find significant correlations between ether extract or fibers and AA digestibility values (data not shown) likely due to the quite constant concentrations of ether extract and fibers in the corn sources.…”

Trade-offs among growth performance, nutrient digestion and carcass traits when feeding low protein and/or high neutral-detergent fiber diets to growing-finishing pigs

“…It has been hypothesized that dietary fiber does not have a significant effect on growth performance, which implies that pigs can tolerate a wide range of dietary fiber levels, if dietary energy density is adequate (Baird et al, 1975;Beaulieu et al, 2009;Gutierrez et al, 2013). In our study, the slight decrease in carcass yield might have occurred because of an increase in intestinal content and/or increased organ development, although the effect was negigible after the usual pre-slaughter fasting periods (12-24 h) used (Santomá, 1997).…”