Effect of selenium supplements and flaxseed in diets on performance and some biochemical metabolites in blood of laying hens

The effect of different sources of Se, together with flaxseed on performance, egg physical qualities and some serum biochemical parameters in laying hens was investigated. In a completely randomized design, 384 "Hy-Line W36" hens (50 wks of age) were assigned to a 3×4 factorial arrangement comprising four replicates of eight for ten weeks. Birds received three basal diets containing 0, 5% and 10% of flaxseed, supplemented with no Se and one mg/kg of Se from sodium selenite, Se-enriched yeast and seleno-hydroxy-methionine(Selisseo). Inclusion of flaxseed decreased egg weight and egg mass(P