Supplemental chromium-loaded chitosan nanoparticles affect growth, serum metabolites and intestinal histology in broilers

The goal of the present research was to evaluate the effects of chromium-loaded chitosan nanoparticles (Cr-CNPs) on production performance, viscera development, serum metabolites and intestinal histology in broilers. Two hundred (200) day-old broilers were randomly divided into five groups with five replicates (n = 8). Birds in the first group served as control and were fed a corn soybean-based diet, while the remaining four supplemented groups were offered 200, 400, 800, and 1200 μg Cr-CNPs/kg of feed, respectively, for 35 days. Weight gain, feed intake and feed conversion ratio (FCR) remained unaffected with Cr-CNP supplementation. No changes were observed in the relative weights of viscera. The relative length of the small intestine was decreased in birds supplemented with 200 and 800 μg Cr-CNPs/kg compared with the 1200 μg Cr-CNP-supplemented group and control. Serum metabolites remained unaffected with Cr-CNP supplementation except for serum HDL, which was increased. Cr-CNPs decreased the retention of chromium in the bone at higher concentrations. Jejunal villus height, villus surface area, and villus height to crypt depth ratio were increased in the 800 μg Cr-CNP-supplemented group. In conclusion, Cr-CNPs did not affect growth performance, viscera development, and most of the serum metabolites, but enhanced jejunal morphological attributes at 800 μg Cr-CNPs/kg of feed.