Abstract
There are many publications revealing the physiological role of kisspeptin in the neurohumoral aspect in various species of wild and domestic animals. However, kisspeptin levels during puberty in cattle are still unclear. The purpose of the research was to study the concentrations of kisspeptin, progesterone and testosterone in the blood serum of Holstein bulls and heifers during puberty. Kisspeptin concentrations remained the same in bulls and heifers until the age of 4 months. Further, starting from 5 months, the concentration of kisspeptin increases in heifers, as does the concentration of progesterone. At the age of 9 and 10 months, the concentration of kisspeptin was significantly higher than in bulls. In bulls, testosterone concentration increased with age. Correlation analysis showed a significant relationship between the concentrations of kisspeptin and progesterone in heifers - a correlation coefficient of 0.797, P>0.01, and the concentrations of kisspeptin and testosterone in bulls - a correlation coefficient of 0.636, P>0.05. Kisspeptin most likely plays a role in puberty. Further research is needed on kisspeptin in relation to reproductive function in Bos Taurus.
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