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This study analyzed the effects of partial replacing of Ca, Fe, Zn, and Cu salts with glycine chelates on the measures of bones health in 16-week-old captive-reared male pheasants, allocated to one of the three experimental groups supplemented with Ca, Fe, Zn, and Cu in forms of inorganic salts (the control group) or groups receiving from the ninth week 25% and 50% of supplemented elements as glycine chelates. At the end of rearing birds receiving chelates were heavier ( p &lt; 0.001) and their tibia showed an increase of numerous mechanical parameters: yield and ultimate force ( p = 0.028, p &lt; 0.001, respectively), stiffness ( p = 0.007), Young modulus ( p &lt; 0.001), compared to the control animals. The bones of birds receiving chelates in 50% were also heavier ( p &lt; 0.001) and longer ( p = 0.014), with thinner cortical bone in midshaft ( p = 0.027) and thicker proximal trabeculae ( p &lt; 0.001) compared to the control. While both doses of chelates increased mineral density in midshaft ( p = 0.040), bone content of Cu and Zn decreased ( p = 0.025, p &lt; 0.001, respectively). The content of immature collagen in cancellous bone and articular cartilage increased in groups receiving chelates ( p &lt; 0.001, p = 0.001, respectively). In conclusion, glycine chelates probably enhanced development of the skeletal system in male pheasants as bones were denser and more resistant to mechanical damage.

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The Influence of the Partial Replacing of Inorganic Salts of Calcium, Zinc, Iron, and Copper with Amino Acid Complexes on Bone Development in Male Pheasants from Aviary Breeding