Effects of Beta Mannanase and Xylanase Supplementation in Low Energy Density Diets on Performances, Nutrient Digestibility, Blood Profiles and Meat Quality in Finishing Pigs

摘要

This study was conducted to evaluate the effects of mannanase and xylanase supplementation in low energy density diets on performances, nutrient digestibility, blood profiles and meat quality in finishing pigs. Mannanase and xylanase improves the nutrient utilization by hydrolyzing Non-starch Polysaccharide (NSP) that prevents the nutrient digestion and absorption. A total of ninety-six pigs (Landracex Yorkshire)xDuroc, 69.1+-1.4 kg average initial b.wt.) were used in a 8 week study. Pigs were allotted into four treatments with six pens/replicates (2 barrows and 2 gilts per pen) per treatment in completely randomized design according to its sex and bodyweight. Dietary treatments were: PC (positive control; basal diet), NC (negative control; 120 kcalkg-1 lower energy diet), NM (NC+0.05% mannanase) and NMX (NC+0.025% mannanase and 0.025% xylanase complex). The present results suggested that the inclusion of NMX led to a higher Average Daily Growth (ADG) than NC treatment (p<0.05). The Average DailyFeed Intake (ADFI) was depressed by NMX treatment compared with NM treatment (p<0.05). Pig fed NMX treatment led to a higher growth efficiency (G:F) than NC and NM treatments (p<0.05). Dietary NMX treatment increased Apparent Total Tract Digestibility (ATTD) for gross energy in 4 week and nitrogen in 8 week (p<0.05) compared with NC treatment. Significantly higher (p<0.05) blood glucose concentration was observed in NMX treatment (83.83 mg dL-1) than NC treatment (77.17 mg dL"1) in 8 week. Dietary NC, NM and NMX treatment decreased the lOth-rib backfat thickness compared with PC treatment (p<0.05). In conclusion, the inclusion of P-mannanase and xylanase could improve the growth performance, nutrient digestibility and reduce the backfat thickness withlow density diet comparable to the high nutrient density diet.