Digestibility of fibre sources and molecular weight distribution of fibre fractions in ileal digesta of growing pigs

Abstract

Seven post-valve T-caecum cannulated growing pigs were used in a change-over experiment with four diets and four 14-day periods to evaluate the total tract apparent digestibility (TTAD) and the ileal apparent digestibility (IAD) of diets with inclusion of chicory forage (CFO), sugar beet pulp (SBP), wheat bran (WB) and grass meal (GM), as well as the TTAD of the mentioned fibre sources. Moreover, this experiment evaluated the molecular weight distribution of soluble non-starch polysaccharide (NSP) fractions in diet and ileal digesta from pigs fed the CFO and SBP diets. The experimental diets were balanced to have similar NSP content and compromised of one part of the basal diet and one part of the four fibre sources (CFO, SBP, WB and GM). In addition, all pigs were fed the basal diet during a 14-day period before and after the experimental periods. Diet affected the TTAD of all dietary components except glucose. The TTAD of organic matter (OM) was higher for Diet SBP than for Diets WB and CFO, showing both were higher than Diet GM. The TTAD of NSP was higher for Diet SBP than Diets WB and GM. The IAD of OM was higher in Diet SBP than in the other diets. The IAD of NSP was lower in Diet WB than in the other diets. The TTAD of OM and energy of CFO was 0.43 ± 0.04 (standard error), which is similar to that reported for commonly used forage crops. The molecular weight distribution in ileal digesta showed different distributions between Diets CFO and SBP as well as between digesta from pigs fed these diets.

Fermentable non-starch polysaccharides increases the abundance of Bacteroides–Prevotella–Porphyromonas in ileal microbial community of growing pigs

“…This suggests that the positive correlation observed between the proportion of propionic acid in ileal digesta and the intake of arabinose mainly can be explained by fermentation of arabinose originating from SBP. Ivarsson et al (2012b) observed differences in molecular weight distribution between pectins in diets CFO and SBP, and Ivarsson et al (2012c) showed that there are strong correlations between molecular weight distribution and the proportion propionic and acetic acid, which suggests that both the building blocks and the molecular weight distribution of pectin can explain the differences in SCFAs between the CFO and SBP. This indicates that the bacterial degradation of pectin is selective and dependent on the molecular weight.…”

“…However, it should be noted that the ileal digestibility in general is higher for pectins than for arabinoxylans (Noblet and Le Goff, 2001). However, Ivarsson et al (2012b), reported a similar ileal digestibility of dietary fiber, NSP and xylose in the GM diet as the SBP and CFO diet. Consequently, a high amount of microbial digested NSP in the present study can be linked to diets GM, SBP and CFO.…”

“…Chemical composition and calculations The chemical composition of diets, feces and digesta, the molecular weight (mol wt) distribution of the soluble NSP fraction of the pectin-rich diets, and digesta from pigs of those treatments, as well as, the total tract (TTAD) and ileal (IAD) apparent digestibility, were analyzed and calculated as previously described by Ivarsson et al (2012b). The amount of digested dietary components for each pig and diet (g) were calculated as ½Intake of dietary component ðgÞ ðTTAD=100 or IAD=100 of the dietary componentÞ Statistical analysis Simpson's diversity index was calculated based on T-RFLP data to assess bacterial species richness and evenness (Begon et al, 2006).…”

Expression of heat shock proteins 27 and 72 correlates with specific commensal microbes in different regions of porcine gastrointestinal tract

“…Interestingly, dietary pectin has been shown to induce HSP expression in rat intestine (37). The pigs in the present study were fed chicory pectin (in a cereal-based diet), which can be partially utilized in the distal ileum of the pig, with digestibility values ranging from 10 to 40% (13,23). It may thus contribute to strong ileal HSP expression.…”

Neutral detergent fiber increases endogenous ileal losses but has no effect on ileal digestibility of amino acids in growing pigs

“…The absence of NDF effect on ileal digestibility of isolated proteins such as casein and SPC has been previously reported (Ivarsson et al . ; Mariscal‐Landín et al . ).…”