Carcass traits
At the end of the experimental period, six broiler chicken birds within each treatment (two chickens/each replicate) were randomly taken and weighed to document live weight. The birds were slaughtered and waited for whole bleeding, and then their feathers were removed. The weights of the carcass, dressing percentage, breast, thigh, giblets (liver, heart and gizzard) and abdominal fat around the gizzard were separately recorded for each bird and reflected as the ratio of live weight.