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One hundred and twenty (100 ♀ + 20♂) 30-weeks-old dual-purpose breeding hens of Gimmi - zah strain were housed in individual cages in a semi-open house. Birds were distributed randomly into five treatments of 20 ♀ + 4♂. The 1 st treatment was fed a control (unsupplemented) diet (17.5% CP and 11.4 MJ P < 0.03; P < 0.0001 and P < 0.0001, respectively) increased due to Se supplementation and the greatest increase was recorded by a group fed diet with the high level (0.40) of organic Se. The duodenal and intestinal mucosa of the ileum was negatively affected by the high level of inorganic Se while chickens fed the organic form showed less toxic effects in hepatic and splenic tissues than those receiving the inorganic form. In conclusion, the organic and inorganic Se supplementation at 0.15 and 0.30 mg/kg diet, which corresponded to a dietary level of 0.25 and 0.40 mg/kg diet, improved the productive and reproductive performance of Gimmizah breeding hens. A decrease in plasma total cholesterol and an improvement in the bone mineralization were observed. The level of 0.25 mg/kg diet of organic Se was adequate to enrich eggs, which may be recommended for practical application and which would improve the consumer health benefit.

czech journal of animal science

Effect of inorganic or organic selenium supplementation on productive performance, egg quality and some physiological traits of dual-purpose breeding hens