Matin Naddaf-Fahmideh - Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht, Iran
Alireza Seidavi - Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht, Iran
Mehrdad Bouyeh - Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht, Iran

This experiment was conducted to investigate the effects of three levels of chromium (Cr) (۰, ۷۰۰, and ۱۴۰۰ µg/kg of diet) on growth performance, carcass characteristics, immunity, blood parameters, cecal microbial flora, meat taste, and fatty acid profile of Arbor Acres commercial broilers. ۱۲۰ one-day-old male chicks with four replicates and ۱۰ chicks per replicate were used in a completely randomized design for ۴۲ days. The results of the experiment showed that the lowest cost per kg of live chicken and the best European production index, without statistically significant difference, was demonstrated in Cr۷۰۰. The growth performance in the whole period (۱-۴۲d) was not affected by Cr (P > ۰.۰۵). The amount of antibody titer against Newcastle virus, influenza, and sheep red blood cells was affected by experimental treatments (P < ۰.۰۵). The data showed that the percentage of saturated fatty acids such as myristic acid, palmitic acid, and stearic acid decreased and the amount of unsaturated fatty acids increased in Cr۷۰۰ and Cr۱۴۰۰ compared to the control group. The fat content, juiciness, color, chewing ability, elasticity, oral sensation, and general acceptance were affected by using Cr (P < ۰.۰۵). Also, the data showed an improvement in cecal microbial flora in broilers fed Cr. In conclusion, it is recommended to feed ۷۰۰ µg/kg Cr Arbor Acres farming.

chromium, Immune system, Taste evaluation, Cecal microbial flora