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Journal of Experimental Biology, Vol 97, Issue 1 301-309, Copyright © 1982 by Company of Biologists

JOURNAL ARTICLES

The respiratory responses of the fowl to hot climates

H Kassim and AH Sykes

Respiratory rate (f) and tidal volume (VT) have been measured at normal and at warm ambient temperatures (Ta) in adult domestic fowl by means of a whole body plethysmograph. Resting values of f = 23 +/- 9 min-1 and of VT = 25.6 +/- 0.9 ml min-1 were found. At Ta 30, 35 or 40 degrees C f increased in direct relation to the severity of the heat stress reaching a maximum values of 273 +/- 12 min-1; VT fell uniformly in all three climates to a minimum of 9.0 +/- 0.5 ml. Total ventilation (V) showed a linear relation with f during first-phase panting. Second-phase panting occurred only at Ta 40 degrees C; V increased at first but subsequently fell as the decline in f became more pronounced.


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© The Company of Biologists Ltd 1982