Influence of hygrothermal conditions on milk production in a free stall barn during hot weather

Presented are results of a study on the influence of air temperature and humidity on milk production by 174 Holstein-Friesian cows kept in a free stall barn. Occurrence of heat stress in three technological groups of cows with help of temperature-humidity index (THI) was specified. The result of heat stress was a decrease in milk yield. There was a strong correlation found (P=0.05) between minimum THI, temperature and milk yield. Delay of decrease in milk production as related to maximum temperature (T

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