The effect of temperature and relative humidity on milk yield of holstein dairy cattle raised in agricultural enterprises under different climatic conditions

This study was conducted to investigate the effect of air temperature and relative humidity on milk yield Holstein dairy cattle raised in Agricultural Enterprises under different climatic conditions Turkey (Polatlı, Türkgeldi, Çukurova) examine differences between enterprises. Records test day for years 2014-2020 obtained from General Directorate (TİGEM) were utilised study. The data set related yields included number cows, lactation orders, control records information animals some environmental factors. In study, values four temperature-humidity indices (THI) consisting combinations daily maximum minimum examined order assess stress yield. Consequently, difference enterprises terms index found be statistically significant (P<0.05). THI value calculated agricultural varied 10 102. It determined that exposed heat May November Türkgeldi Polatlı cold climate zone April July Çukurova temperate zone. While with low weight optimal indicator a humid climate, high-temperature best semi-arid climate.