In comparison to the group of birds receiving Zinc Glycine Chelated Mineral (Zn-Gly), the study showed statistically significantly lower serum and liver concentrations of SAA in the group of chickens that received zinc in the other organic forms. Similar results were observed in the case of the concentrations of transferrin (TRF), haptoglobin (Hp), alpha-1-acid glycoprotein (a-1-AGP), and C-reactive protein (CRP).