Effects of long-term supplementation with amino acid-complexed manganese on performance, egg quality, blood biochemistry and organ histopathology in laying hens

The current study was conducted to evaluate the effects of long-term dietary supplementation of amino acid-complexed manganese (Mn) on production performance, egg quality, blood biochemistry and organ histopathology in laying hens. A total of 756 Hy-Line Brown layers were randomly assigned into 7 dietary groups with 6 replicates. Each replicate contained 18 birds. Layers were fed a basal diet (Mn, 21.95 mg/kg) or the basal diet supplemented with...