Does the dietary supplementation of organic nano-zinc as a growth promoter impact broiler's growth, carcass and meat quality traits, blood metabolites, digestive enzymes and cecal microbiota?

The present investigation aimed to examine the impact of different dietary organic zinc nanoparticle (ZnNP) levels on gut bacteria, meat quality, growth performance, carcass traits, and blood indicators of broilers. A total of 180 unsexed one-week broiler chicks (Cobb) were allotted to three experimental groups and received a basal diet supplemented with 0, 0.2, and 0.4 mg ZnNPs /Kg diet, respectively. The results showed that, after 38 days of age, the supplementary ZnNPs at a level of 0.4 mg /Kg raised body weight and weight gain compared to the control and 0.2 mg ZnNPs /kg diet. The addition of ZnNPs improved the daily feed intake. Some of the carcass characteristics in ZnNPs groups excelled that of the control. ZnNPs treatments gave higher dressing % and decreased (P < 0.05) the cholesterol rates, LDL, and uric acid in the blood. In addition, it gave the best concentrations of ALT and AST. The ZnNPs groups exhibited substantially (P < 0.05) improved moisture and fat values in meat samples. The group given ZnNPs at a concentration of 0.4 mg/kg had a substantially (P < 0.05) lower count of TYMC and E. coli. In conclusion, the high level of ZnNPs (0.4 mg /Kg) improved the broilers' performance and some of their carcass traits, enhancing their health and meat quality.