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At the time of hatching in poultry there are three physiological systems that are not fully developed:
Digestive
Immune
Temperature regulation
In this article we will talk about temperature regulation
Body temperature at hatch
Upon hatching, the birds are poikilothermic animals: their body temperature will rise or fall depending on the environmental temperature, requiring a metabolic effort by the birds. It will take around 4 days for chicks from adult flocks and 5 to 6 days for birds from young flocks for the thermoregulatory system to behave homeothermically – constant body temperature.
It is proposed that birds from younger flocks present a different composition of lipids in their yolk, this being the factor that makes them need more time to go completely from poikilothermic to homeothermic.
Comfort zone
There is a range of body temperature known as the comfort zone, where the birds are comfortable with the temperature that surrounds them:
The best way to “find” the comfort zone is to measure the birds’ cloacal temperature.
If the cloacal temperature is above or below this range, adjustments should be made to the ambient temperature.
Where to measure the cloaca temperature?
This information will help us adjust the temperature and ventilation of the hatcher according to the flock that are currently inside the machine.
If the birds’ temperature is above 40.5 ° C (105 ° F) and the machine’s cooling system does not allow the temperature to be lowered further, the birds must be removed and they must be housed in a room where they find their comfort zone.
After processing or service
During sexing, vaccination or in beak or spur treatments, the temperature of the birds will drop to ranges of 38.3 – 38.9 ºC (101-102 ° F).
Particular care should be taken with birds after being exposed to spray vaccines, as their temperature can drop greatly if the drop is not correct. At the end of these operations, in the waiting room to be loaded in the truck, the birds must recover their body temperature between 39.5 – 40.5 ºC (103-105 ° F).
During transportation
Upon arrival at the destination farm, as the chicks are being unloaded from the truck, it must be monitored the temperature of the birds inside the boxes.
Preferably, the temperature of birds from different parts of the truck should be monitored, particularly when it is a large truck.
At the farm
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