Abstract :
Under abnormally hot summer conditions, black-globe temperature directly affected the
thermal behaviour of the Chios and the Karagouniko breed. The dairy ewes had respiration
rates (breaths/min) above normal, whereas their body temperature (◦C) was not affected.
The two breeds seek shade during sun presence and cooled-off at the outside lot during
night. As a result their minimum and maximum respiration rate values were strongly associated
to minimum and maximum black-globe temperature values. As heat ensued towards
noon the apparent short-term heat stress of the Chios ewes was milder than that of the
Karagouniko ewes as indicated by the significantly lower respiration rate.
