Linear dose response relationship between supplemental Zn sources and tibia Zn content. Relative Zn bioavailability for ZnSO4 is 100%, for zinc glycinate (ZnGly) is 115%, and for zinc pectin oligosaccharides (ZnPOS) is 152%. y = 152.951 + 0.033 × x1 + 0.038 × x2+ 0.050 × x3 (R2 = 0.383). The SE were 8.366, 4.471, and 3.024 for x1, x2, and x3, respectively. Values on the x-axis are based on added values for Zn in the diets.