Heat stress is a critical issue in poultry production. The detrimental effects of heat stress on broilers range from endocrine and immune disorders to decreased growth performance and an increased mortality rate.
Heat stress depends on environmental factors (temperature and humidity), species, age, weight, etc.
THI measures the combined effects of ambient temperature and relative humidity to define the level of heat stress.
↓ Corticosterone concentration
↑ Thyroid hormones
↓ Body temperature
↑ Survival rate
↑ Feed efficiency