УДК 636.2.06.082.2:612.017
https://doi.org/10.61562/mgfa2023.03
DYNAMICS OF THE CORTISOL LEVEL IN THE BLOOD OF YOUNG CATTLE
Biriukova О.D., Lesniak Yu.I., Basovskiy D.N., Vintoniv N.А.
Institute of animal breeding and genetics nd. a. M.V.Zubets of National Academy of Agrarian Science of Ukraine (Chubynske, Kyiv region, Ukraine) e-mail: irgt.spetsrada@ukr.net
Abstract: The aim of the study was to evaluate the biological patterns of the dynamics of cortisol levels in the blood serum of calves of the Ukrainian Red-and-White dairy breed. According to the results of the eosinophilic test, 52.4% of individual’s resistant to stress were identified in the group of studied calves. Of all the calves assessed as resistant to the stressor, 68.2% were bulls. The average level of cortisol in calves was 26.2±0.8 ng/ml. As the age of the calves’ increases, there is an increase in the concentration of cortisol in the blood serum. The intensity of the increase in the level of cortisol in different periods of postnatal ontogenesis is uneven. A high direct statistically significant rank correlation was recorded between the levels of cortisol in the blood serum of calves at different ages (r=+0.89±0.054 - + 0.99±0.117, P<0.001). It has been established that the change in the level of cortisol in the blood serum of calves in the process of postnatal ontogenesis depends on gender. In bulls, serum cortisol concentration was significantly lower (on average by 66%, P<0.01)
DYNAMICS OF THE CORTISOL LEVEL IN THE BLOOD OF YOUNG CATTLE
Biriukova О.D., Lesniak Yu.I., Basovskiy D.N., Vintoniv N.А.
Institute of animal breeding and genetics nd. a. M.V.Zubets of National Academy of Agrarian Science of Ukraine (Chubynske, Kyiv region, Ukraine) e-mail: irgt.spetsrada@ukr.net
Abstract: The aim of the study was to evaluate the biological patterns of the dynamics of cortisol levels in the blood serum of calves of the Ukrainian Red-and-White dairy breed. According to the results of the eosinophilic test, 52.4% of individual’s resistant to stress were identified in the group of studied calves. Of all the calves assessed as resistant to the stressor, 68.2% were bulls. The average level of cortisol in calves was 26.2±0.8 ng/ml. As the age of the calves’ increases, there is an increase in the concentration of cortisol in the blood serum. The intensity of the increase in the level of cortisol in different periods of postnatal ontogenesis is uneven. A high direct statistically significant rank correlation was recorded between the levels of cortisol in the blood serum of calves at different ages (r=+0.89±0.054 - + 0.99±0.117, P<0.001). It has been established that the change in the level of cortisol in the blood serum of calves in the process of postnatal ontogenesis depends on gender. In bulls, serum cortisol concentration was significantly lower (on average by 66%, P<0.01)
Keywords: dairy cattle, Ukrainian Red-and-White Dairy breed, sensitivity to stress, hormonal level
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