Abstract
Heat stress is an environmental factor that negatively affects the morphological and physiological properties of dairy cattle. The aim of this study is to investigate the relationship between heat stress and milk yield, milk fat ratio and body temperature in Holstein-Friesian dairy cattle. Data Southeastern Anatolia Region of Turkey's Siirt province was obtained from a special Kurtalan Farm. Milk yield and content of 13 head Holstein-Friesian dairy cattle were recorded in March, April, May, June, July, August and September. In addition, temperature and humidity records were recorded in the farm and in the parlor to be used for calculating the temperature humidity index value. In the analysis of data, correlation and regression methods were used in SAS 9.4 program. As a result, positive correlation (P <0.001), milk yield and milk fat ratio and negative correlation (P <0.05, P <0.01) were detected between heat stress and body temperature. In addition, a significant negative relationship was observed between rectal temperature and milk yield (P <0.01).
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