Rigid pectin-cellulose-lignin matrix limits fermentation of canola (Brassica napus) meal polysaccharides in pigs

Research output: Chapter in Book/Report/Conference proceedingAbstractAcademic

Abstract

Degradation of non-starch polysaccharides (NSP) from canola meal (CM) is rather low (~60%) compared with NSP from other sources, such as soybean meal (~85%). Feed processing technologies might be used to improve degradability of NSP, but developing targeted technologies requires insight in the recalcitrant NSP-structures in CM. To identify the limiting structures in degradation of NSP from CM, undegraded carbohydrate structures from ileum, cecum, colon, and feces from pigs were studied in depth. A diet, containing 40 % (w/w) CM as the only NSP-source, was fed to growing pigs (gilts; initial BW: 20.8 ± 2.4 kg) for 14 days. Feces were collected during four days after which animals were euthanized to collect digesta samples. Ileal digestibility of NSP from CM was 22 % and total tract digestibility 68%. Water-soluble NSP were found to be almost completely fermented. Nearly 50 % of the unfermented carbohydrate structures in feces were found to be tightly bound pectins (e.g. rhamnogalacturonan and arabinan), xyloglucan, and cellulose, presumably, present as a rigid cellulose-lignin network in CM. The other half consisted of smaller uronyl-rich carbohydrates that were released during alkaline extraction of the feces. Presumably, these carbohydrates were present via ester-linkages or hydrogen-bonding within the cellulose-lignin network in the original CM. Apparently, microbiota present in the pigs’ digestive tract were able to partly degrade those carbohydrates but still complete fermentation was hindered by ester- or H-bonds.
Original languageEnglish
Title of host publicationProceedings of the 2014 BANFF Pork Seminar Advances in Pork Production
EditorsR.T. Zijlstra, M.K. Dyck, M. Wolfe Lafreniere
Place of PublicationEdmonton, Alberta, Canada
PublisherUniversity of Alberta
Pages19-19
Volume25
Publication statusPublished - 2014
EventBanff Pork Seminar Advances in Pork Production, Banff, Canada -
Duration: 21 Jan 201423 Jan 2014

Seminar

SeminarBanff Pork Seminar Advances in Pork Production, Banff, Canada
Period21/01/1423/01/14

Fingerprint Dive into the research topics of 'Rigid pectin-cellulose-lignin matrix limits fermentation of canola (Brassica napus) meal polysaccharides in pigs'. Together they form a unique fingerprint.

Cite this