Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Rumyana IVANOVA, Toncho PENEV, Hristo HRISTEV, Zivka GERGOVSKA
The present study examines some physiological and biochemical parameters in dairy cows depending on the temperature-humidity index (THI) in spring (May) and summer (August) in two different time zones - 10 and 15h. The temperature-humidity index (THI) in a semi-open type of building, the body temperature, pulse rate and breathing were measured twice a day (10 and 15.00 o’clock), as well as the number of ructus of the dairy cows per 24 hours in spring and summer. Changes in the biochemical parameters of the total protein, creatinine and urea were ascertained in relation to the changes in THI and the season, which are within the reference values for cattle. The high THI lowers the blood sugar levels (up to 31%), but increases the total bilirubin levels (up to 3 times) and the transaminases activity (ASAT up to 3 and ALAT - up to 4.5 times) compared to the reference values for the respective species. The changes in THI values have a statistically significant influence on the heart rate, respiration and body temperature (p<0.001). The month (season) of the study has a statistically significant influence on the blood sugar, total protein, urea and bilirubin (p<0.001) and less influence on the body temperature (p<0.01) and creatinine (p<0.05.)
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