The study concerned the development of thermoregulation in calves at age of 1 to 50 days of life. Rectal temperature /tr/, skin temperature at thermostable /ts/ and thermolabile /tl/ sites and heat flux /Q/ at these points were measured. At the same time, microclimatic conditions of barn /t, e, f, V, H/, were controlled. One concluded some independence of rectal temperature from the age of animals and slight relationship between tr and skin temperature. Together with the animal growth, skin temperature at thermostable points increased, whereas at thermolabile sites decreased. Moreover, decreasing correlation between skin temperature and cooling factor was demonstrated, what can suggest the development of thermoregulatory abilities in calves. Heat flux was markedly correlated with skin temperature.
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