ABSTRACT
To study the effects of rapeseed meal and iodine supplementation on performance, organs weight and some biochemical parameters of broiler chicks. Completely randomized design with 3 dietary treatments. One hundred and twenty one-day-old Arian broiler chicks [mixed male and female]. Chickens were categorized into 3 groups: soybean meal, rapeseed meal, and rapeseed meal plus iodine [2mg/kg]. feed intake, body weight gain and feed conversion ratio were determined at the end of starter, grower, finisher and whole priod states Moreover, the values of relative weight of liver, gallbladder, heart, spleen, gizzard, abdominal fat pad and carcass accompaning with serum concentrations of triiodothyronine, thyroxine, gamma glutamyltransferase and alanin aminotransferase were determined at 49 day of age. Significant differences among treatments determined by Duncan's multiple range tests. While rapeseed meal [RSM] reduced, body weight gain and feed conversion ratio, iodine supplement did not affect body weight gain and feed conversion ratio during starter, grower and whole period states. In contrast to iodine treatment the highest weight of gallbladder and its ratio to whole body weight were seen with RSM. The weight of abdominal fat pad and its ratio to whole body weight were reduced in RSM and RSM puls iodine supplementation. Iodine Supplementation had effect on the concentration of thyroxine, triiodothyronine gamm glutamyltransferase and alanin aminotransferase in RSM group. The complete replacement of rapeseed meal with soybean reduced performance and concentration of triiodothyronine hormone, and increased some organs weight, idoine supplementation had no effect on erfrmanc