Effects of a Commercial Beta-Mannanase Product on Growth Performance, Intestinal Histomorphology, Bone and Body Composition, and Amino Acid Digestibility in White Pekin Ducks
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2018 The Author(s). Two experiments were conducted to evaluate effects of a commercial -mannanase in duck diets 1-21 d. Both experiments included 0%, 0.01%, 0.05%, 0.1%, and 0.2% of -mannanase treatments. Experimental units of 5 birds per pen were replicated 8 times in 4 different rooms. The data were analyzed as a 2 (Experiment) 5 (Treatment) 8 (Replicate) factorial analysis. Body weight of all -mannanase groups was 66 g and 79 g greater than control fed birds at day 14 and 21, respectively. All -mannanase groups had an average of 0.1, 0.14, and 0.08 lower feed conversion than controls at day 7, 14, and 21, respectively. Productivity index increased over controls by an average of 41, 81, and 48 on day 7, 14, and 21, respectively. Illeal length of all -mannanase groups was greater than controls, and the 0.01% and 0.05% -mannanase groups had 0.66 lower ileal viscosity than controls. Ducks fed 0.10% -mannanase had greater ileal villi height than control, 0.01%, and 0.20% -mannanase groups. Feeding diets with 0.05%, 0.10%, and 0.20% -mannanase resulted in greater ileal villi width compared to controls. These treatments had greater ileal crypt depth than control and 0.05% -mannanase groups. All -mannanase treated groups had greater amino acid digestibility than controls. -Mannanase at 0.10% resulted in a lower percentage of fat and greater bone strength than control and 0.20% -mannanase. This study demonstrated that addition of -mannanase positively affects duck growth performance, gut morphology, and digestibility.
