The effect of different sources of zinc and selenium elements on performance, blood parameters, antioxidant status, immune response and quality characteristics of eggs of commercial laying hens during the peak production time.

In this research, the effect of zinc and selenium synthesized from nano-mineralized probiotics was investigated on yield characteristics, egg quality characteristics, antioxidant status, and immune response of laying hens. A number of 576 high-line laying hens at the peak of production (from 25 to 37 weeks of age in three four-week periods) were used as a completely randomized design with a 3x3 factorial experiment with eight replications and eight birds per replication. Experimental treatments are 1. The control diet (without selenium and zinc), 2. Control diet + selenium chelate, 3. Control diet + zinc chelate, 4. Control diet + zinc synthesized from probiotics, 5. Control diet + selenium synthesized from probiotics, 6. Control diet + zinc chelate + selenium chelate, 7. Diet Control + zinc chelate + selenium synthesized from probiotic, 8. Control diet + zinc synthesized from probiotic + selenium chelate, 9. Control diet + zinc synthesized from probiotic + selenium synthesized from probiotic. The results showed that using zinc and selenium synthesized from probiotics increased production percentage, average egg weight, and improved feed conversion ratio (P<0.05). The serum concentration of cholesterol, triglyceride and malondialdehyde in chickens receiving probiotic zinc and selenium was the lowest. The serum HDL concentration and total antioxidant index were the highest compared to other treatments (P<0.05). In general conclusion, zinc and selenium synthesized from nano-mineralized probiotics have a better performance in laying hens.