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01/Aug/2016
Physiological parameters for thermal stress in dairy cattle
Vanessa Calderaro Dalcin, Vivian Fischer, Darlene dos Santos Daltro, Evelyn Priscila München Alfonzo, Marcelo Tempel Stumpf, Giovani Jacob Kolling, [...]
DOI: 10.1590/S1806-92902016000800006
ABSTRACT The objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress. Blood samples were collected for analysis and included hematocrit (Ht), erythrocyte count (ERY), and hemoglobin count (HEMO). In addition, physiological variables, including rectal temperature (RT), heart rate (HR), respiratory rate (RR), and panting score (PS) were recorded in 38 lactating cows. These varied according to genetic group (1/2, 3/4, and pure […]
Keywords: broken line; critical values; thermal comfort; thermoregulation