An imbalance between metabolic heat production inside the animal body and its dissipation to the surroundings results to heat stress (HS) under high air temperature and humid climates. Behaviour is expression of an effort to adapt to internal and external conditions. The foremost reaction of animals under HS is change in behaviour and affected performance. Heat stress directly affects feed intake thereby, reduces production (growth rate, milk yield) and reproductive performance, and even death in extreme cases. Animal-based indicators are used to detect the animal under heat stress at the earliest and subsequently preventive measures can be taken accordingly.
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