CONCLUSIONS
The results of the biological evaluation of the use of inorganic (ZnO) as well as organic (Zn-glycine) forms of zinc in chicken feeding allow for the formulation of the following conclusions as regards the group of broiler chickens receiving Zn-glycine from feed:
• drop of body weight and feed conversion rate were at similar levels;
• lower mortality;
• increased percentage of breast and leg muscles and thick flanks in the carcass and a higher dressing percentage at the same time;
• increased content of fat in the breast and leg muscles;
• increased content of zinc in the breast and leg muscle, liver, kidneys and the thigh bone.
As far as chickens are concerned, better bioavailability of zinc from Zn-glycine contributes to a reduction in environmental emission of this element. Products of animal origin with an increased content of zinc are decent sources of this element in human diet.