Study the effect of physical size of clinoptilolite on liver histology, carcass traits and blood enzymes activity of broilers fed rations contaminated with aflatoxin

This experiment was conducted for determining of the effect of physical sizes and levels of clinoptilolite on liver histology، protein and energy efficiency ratio، carcass traits and blood enzymes activityof broilers fed rations contaminated with aflatoxin. Clinoptilolite were used in two levels (1. 5 and 3%) and three physical sizes (<0. 25 mm، 0. 4 -0. 8 mm and 1-2 mm). On the basis of the results، Broilers fed by non-contaminated diets with aflatoxin had the highest protein and energy efficiency ratio and the lowest protein and energy efficiency ratio were found in broilers fed by contaminated diets with aflatoxin (P<0. 05). Also، using of 3% clinoptilolite with particle size of 1- 2 mm in contaminated diet improved protein and energy efficiency ratio than the aflatoxin contaminated diet and without additive (P<0. 05). The highest and the lowest liver percentage were obtained in broilers fed by contaminated diet with aflatoxin and non-contaminated diets with aflatoxin respectively (P<0. 05). The highest and the lowest amount of blood aspartate amino transferase and alkaline phosphatase were found in broilers fed by contaminated diet with aflatoxin and non-contaminated diets with aflatoxin respectively. Using of 3% clinoptilolite with particle size of 1- 2 mm decreased the level of blood aspartate amino transferase and alkaline phosphatase in broilers fed by contaminated diet with aflatoxin (P<0. 05). Therefore، it can be concluded that the supplementation of diet contaminated with aflatoxin with clinoptilolite had positive effects on protein and energy efficiency ratio and blood parameters in broilers.