Abstract
Eggs of Muscovy duck and domestic fowl were incubated at 37.5°C and relative air humidity of 70%. After 60 min the influence of lowered (31.5°C, 34.5°C and 28.5°C) T a on heat production (HP) and temperature of the allantoic fluid (T af) as a measure of core temperature was estimated for 3 h. The Q 10 was calculated using the relationships between T af and HP. HP dropped with decreasing T af. The Q 10 crossed the 2.0 threshold mostly between 34°C and 36°C T af in dependence of T a. Precocial birds are endothermic in the last third of incubation but these reactions have only an ultimate but not a proximate influence on efficiency of thermoregulation.
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