CHANGE IN BLOOD ANTIOXIDANT STATUS OF HANOVERIAN HORSES DURING FOUR YEAR SEASONS
2011
Georgieva, N., Thracian University, Stara Zagora (Bulgaria) | Barzev, G., Thracian University, Stara Zagora (Bulgaria)
The aim of the present study was to establish the influence of climatic changes on antioxidant status in the blood of Hanoverian horses during the four seasons of the year. The oxidant/antioxidant equilibrium of 20 healthy horses was assessed by blood antioxidant marker analyses, i.e. determination of malondialdehyde - MDA blood concentrations, erythrocyte activity of the antioxidant enzymes superoxide dismutase - SOD and catalase - САТ. The highest MDA values - 3.106 ± 0.165 μM, combined with low SOD activity - 1876.69 ± 146.5 U/gHb and a compensatory increase of the CAT activity - 34508.94 ± 1511.23 U/gHb werе detected in the spring. The results showed strong oxidative stress during the spring, resulting from the continuous influence of the low temperatures and humidity in the winter. Oxidative stress tended to increased in autumn - MDA 2.032 ± 0.132 mM, SOD 4095.414 ± 196.17 U/gHb and CAT 27410.75 ± 3225.06 U/gHb although at an extent lower than the winter values. The beginning of summer could be accepted as the most appropriate time for physical training of horses because of the lowest MDA values - 1.530 ± 0.047 mM measured.
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