Hematology parameters and physical response to heat stress in dairy cows
2010
Belic, B., University of Novi Sad, Novi Sad (Serbia). Faculty of Agriculture | Cincovic, M.R., University of Novi Sad, Novi Sad (Serbia). Faculty of Agriculture | Stojanovic, D., Scientific Veterinary Institute Novi Sad, Novi Sad (Serbia) | Kovacevic, Z. | Medic, S., VetLab Laboratory, Belgrade (Serbia) | Simic, V., VetLab Laboratory, Belgrade (Serbia)
Heat stress in dairy cows occurs during July and August. The trial was attended by 10 cows in summer and the same 10 cows in the winter season. Physical response: increase in rectal temperature and pronounced diurnal variations can be observed during the summer (38.3:39, p is less than 0.01), a significant increase in the respiration per minute (46.5:65, p is less than 0.01) and decrease rumen contraction (10.75:5.5, p is less than 0.01). Haemotology: heat stress leads to certain hematological changes, such as: decrease in the number of erythrocytes (7,38:6,51, p is less than 0.01), decrease in MCV (53.25:47.31, p is greater than 0.05), decrease in hematocrit (39.3:30.8, p is less than 0.01), decrease of white blood cells (9.18:7.75, p is less than 0.01) and plateles (425:351, p is less than 0.05), as well as decrease in the concentration of hemoglobin (111.5:107, P is greater than 0.05). Hematological changes indicates overhydration signs, indicating active body cooling evaporation. Correlation between physical and hematology response were significant.
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