TITLE

Understanding carbohydrate structures fermented or resistant to fermentation in broilers fed rapeseed (Brassica napus) meal to evaluate the effect of acid treatment and enzyme addition

AUTHOR(S)
Pustjens, Annemieke M.; de Vries, Sonja; Schols, Henk A.; Gruppen, Harry; Gerrits, Walter J. J.; Kabel, Mirjam A.
PUB. DATE
April 2014
SOURCE
Poultry Science;Apr2014, Vol. 93 Issue 4, p926
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Unprocessed and acid-extruded rapeseed meal (RSM) was fed to broiler chickens, with and without addition of commercial pectolytic enzymes. Non-starch polysaccharide (NSP) fermentability and unfermented NSP structures from RSM were studied in the excreta in detail. From unprocessed RSM, 24% of the nonglucose polysaccharides could be fermented. Acid treatment did not have a significant effect, but enzyme addition did improve fermentability to 38%. Most likely, the significant increase in NSP fermentability can be ascribed to the addition of pectolytic enzymes, which decreased branchiness of the water-soluble arabinan. Mainly xyloglucan, (glucurono-)xylan, (branched) arabinan, and cellulose remained in the excreta. The proportion of unextractable carbohydrates increased in excreta from broilers fed acid-extruded RSM. Probably, acid extrusion resulted in a less accessible NSP matrix, also decreasing the accessibility for pectolytic enzymes added in the diet. During alkaline extraction of the excreta, 39 to 52% (wt/wt) of the insoluble carbohydrates was released as glucosyl- and uronyl-rich carbohydrates, probably originally present via ester linkages or hydrogen bonding within the cellulose-lignin network. These linkages are expected to hinder complete NSP fermentation and indicate that digestibility of RSM may benefit substantially from an alkaline treatment or addition of esterases.
ACCESSION #
95333937

 

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