Effects of a Commercial Mannan-Oligosaccharide Product on Growth Performance, Intestinal Histomorphology, and Amino Acid Digestibility in White Pekin Ducks

摘要

Two identical experiments were conducted to evaluate the effects of a commercial mannan-oligosaccharides product. Both experiments included treatment of 0, 250, 500, 1000, and 2000 g/ton of a prebiotic yeast cell wall product containing mannan-oligosaccharides (YCW-MOS). Addition of YCW-MOS to duck diets decreased (P = 0.0001) day 21 feed consumption about 90 g per bird, decreased (P = 0.0198) day 1-21 feed conversion ratio by as much as 6 points. Productivity index at day 21 increased (P = 0.0179) by as much as 31 points. There were no effects of YCW-MOS on intestinal length, weight, index, and digesta viscosity. However, the YCW-MOS-treated groups had as much as 26% greater (P = 0.0439) area of jejunal goblet cells, 12% greater quantity of jejunal goblet cells (P = 0.0350) and asmuch as 43% greater (P = 0.0233) numbers of ileal goblet cells than the control group. The YCW-MOS-treated group also had greater cysteine (P = 0.0057), histamine (P = 0.038), and tryptophan (P = 0.0070) ileal digestibility (6-8 points improvement) than the control group. This study demonstrated that addition of 1 kg/ton of mannan-oligosaccharides in duck feeds affects duck live performance and produces modest changes in gut morphology and amino acid digestibility.