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This study aims to reduce embryonic mortality, increase body weight, and improve immune system in chicken. A total of 240 eggs were assigned to three treatments (n = 60) and injected with cooper (Cu), zinc (Zn), and iron (Fe) loaded by montmorillonite (Mnt), and one untreated group (n = 60). Some hormones and enzymes related with growth were measured in terms of serum, and expression of some genes related to growth, immune, and programmed cell deaths that were determined in the liver and spleen of chicken by RT-qPCR. The embryonic death on the fifth and seventh days after injecting eggs with Fe-Mnt was less obvious than in other groups. The heaviest body weight was recorded for Fe-Mnt and Cu-Mnt treatment. Fe-Mnt treatment had higher serum GSH, SOD, GH, and Myostatin contents and lower MDA than those in the other treatments. Cu-Mnt treatment included the highest contents of CAT enzyme and IGF-1 hormone in serum. The highest expression of IGF-1, GH, BCL6, and SYK genes in liver tissue were recorded by Zn-Mnt, IGFBP2, FGF8, and IFNW1 genes by Cu-Mnt, and TC1RG1 and IFNW1 genes by Fe-Mnt in spleen tissue. In conclusion, Fe-Mnt was the best treatment for reducing embryonic mortality, and increasing body weight of chickens and expression of growth and immune genes, followed by Cu-Mnt treatment.
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