Manganese-methionine chelate improves antioxidant activity, immune system and egg manganese enrichment in the aged laying hens.

Dietary supplementation with 50-75% Mn-methionine has the potential to replace Mn-sulphate in laying hens' diet for improving eggshell quality, Mn deposition in the eggshell, antioxidant capacity and immune response, as well as improving laying performance, egg weight and feed conversion ratio.