Effects of beta-glucanase and xylanase supplementation in pigs fed a diet rich in nonstarch polysaccharides : composition of digesta in different prececal segments and postprandial time : Effects of beta-glucanase and xylanase supplementation in pigs fed a diet rich in nonstarch polysaccharides

The effect of nonstarch polysaccharides (NSP) degrading enzymes on nutrients in the upper digestive tract to a diet rich in NSP was studied in pigs. The experimental diets consisted of barley, rye, wheat bran and soy bean meal, containing 18,9 % NSP with 4,5 % of dry material ß-flucan (BG), 9,4 % arabinoxylan (AX) and 2,9 % cellulose. The diet that was supplemented with a commercially available enzyme premix (ZY 28) provided Xylanase (EC 3.2.1.8) and 1,4-ß-Glucanase (EC 3.2.1.4) as the main enzyme activities. A total of 36 male castrated pigs (German Landrace) received the diets during a 3-week-period (12-h intervals, 850 g per meal in the last 3 days). After this eriod, the animals were killed at 1 h, 3 h and 6 h postprandial (mean bodyweight 39 kg). The contents of the stomach and small intestine (divided into two sections of equal length; SI1, SI2) were collected. In all samples the raw nutrients, starch and NSP including soluble and insoluble fractions were determined. The comparison of the groups was each based on six animals. In the stomach, enzyme supplementation exerted non influence on concentration (in dry matter) of nutrients, starch and NSP. However, in the small intestine the concentration of crude protein (reduce in SI1, 3 h ppr) of ether extract (reduced in SI1 1 h and 3 h ppr, in SI2 1 h ppr) were affected significantly. Concerning the NSP, in SI1 the BG concentration tended to be lower whereas the soluble percentage of AX was significantly increased. In SI2, the BG concentration decreased significantly due to a lowered concentration of insoluble and soluble fractions of BG, but there were no changes in AX. Cellulose concentration was unaffected.