Effects of zinc glycine chelate on growth performance, carcass characteristics, bone quality, and mineral content in bone of broiler chicken

A total of 250 one-day-old male broilers (Ross 308) were used to investigate the effects of dietary Zn-Gly (zinc glycine chelate) supplementation on growth performance, carcass characteristics, bone quality, and mineral content in bones. All broilers were randomly assigned to five treatment groups, each of which was replicated five times (10 birds in each cage). 5 groups were formed: control negative – CN (corn-wheat and soybean meal control diet with no supplementation of Zn), control positive – CP (CN+100 mg of Zn as oxide/kg of diet), and 3 groups with Zn-Gly supplementation at three doses: 25, 50, or 100 mg kg−1 (CN +25, 50, or 100 mg of Zn as glycine chelate/kg of diet). The experimental diets were fed to chicks for over 6 weeks. In the study, a positive trend to gain body weight and the weight of breast, thigh, and drumstick muscles was observed when organic Zn was introduced, in particular at a dose of 50 and 25 mg. The addition of Zn, regardless of its source, had an effect on the increase (P