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Abstract
1. Changes in respiratory rate (f), rectal temperature (Tr ) and blood acid‐base values were measured in laying hens exposed to ambient temperatures (Ta) of 32, 35, 38 or 41 °G.
2. At Ta 32 °G there was no panting. At Ta 35 °G panting occurred without any increase in Tr but there was a slight alkalosis (pH 7.55).
3. At Ta 38 °G Tr increased and panting was accompanied by moderate alkalosis (pH 7.58).
4. At Ta 41 °G Tr increased considerably and severe alkalosis developed (pH 7.65).
5. From the relation between Tr , f and pH it is concluded that some degree of alkalosis is a normal response to panting in the laying hen.
Notes
Present address: Faculty of Veterinary Science, University of Khartoum, Sudan.