Effects of oligosaccharides on performance, egg quality, nutrient digestibility, antioxidant status, and immunity of laying hens: a meta-analysis

A meta-analysis was conducted to determine the effects of different types oligosaccharides (OS) on egg quality, intestinal profile, nutrient digestibility, and immunity laying hens. dataset constructed from articles published between 2006 2023 via a literature search using several keywords related hens’ performance. After careful evaluation, final developed 25 in vivo studies comprising 165 comparisons. The meta-regression showed that levels OS supplementation curvilinearly increased (p < 0.05) hen day production (HDEP), crude protein digestibility (CPD). However, did not affect > feed intake (FI), conversion ratio (FCR), mass, weight, eggshell thickness, shell strength, Haugh unit. positively improved antioxidant activity, as indicated by curvilinear effect superoxide dismutase (SOD) malondialdehyde (MDA) concentration. In categorical meta-analysis, mannan oligosaccharide (MOS), xylooligosaccharides (XOS), chitosan (COS) significantly 0.01) HDEP CPD. MOS only type decreased FCR while FOS increase To sum up, could generally but is superior improving better than other thickness.HIGHLIGHTSOligosaccharides hens.Mannan improves hens.Elevated trends IgG IgA after with oligosaccharides.Fructo-oligosaccharides improve thickness suppress Malondialdehyde