Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Rumyana IVANOVA, Smilyana TASHEVA
A one-year study of the Temperature-humidity index (THI) was conducted in three buildings used for breeding dairy cows (farms). They were kept free in separate boxes or as a group living on a permanent litter bedding. Blood samples from 6 animals from each farm were taken and the following biochemical indicators were tested - blood sugar, total protein, urea, cholesterol, creatinine, cortisol, aspartate aminotransferase (ASAT), alanine aminotransferase (ALAT), calcium(Ca), phosphorus (P), magnesium (Mg), sodium (Na), potassium (K) and chlorine (Cl). It was found that the season has a significant effect on THI, blood sugar, total protein, urea, cholesterol, creatinine, cortisol, ASAT, ALAT, Na and K (P<0.001), and a significant effect on Ca and P (P<0.01). The change in the values of THI, cortisol (P<0.001), urea and cholesterol (P<0.01) are related to the breeding technology. The blood sugar, creatinine, P, Mg, Na, K and Cl values are not affected by the type of building and are within physiological norms. Variations of the studied parameters are related to season and breeding technology.
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