Abstract
The aim of this study was to determine the level of testosterone in roosters of the Polbar breed at 8, 12 and 18 weeks of age. Testosterone concentration in blood serum was determined
in each of 50 roosters, using a device called Mini Vidas ® enzymatic method – fluorescent ELFA (Enzyme Linked Fluorescent Assay). Steroid hormone – testosterone in roosters of the Polbar breed showed upward trends of the hormone in blood serum with the maturation of sexual organs responsible for its production. The increase in testosterone in roosters was rapid in each of the periods. It should be noted that roosters subjected to the experiment did not yet reach sexual maturation. The level of testosterone in the blood serum increased with the age of the roosters. Variability occurs in roosters affected by the substantial range of concentrations of testosterone.
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