Relationship of Scalp Color to Production Performance and Heat Tolerance of Holstein Cows

This study was conducted at Taj Al-Nahrain cows station in Al-Qadisiyah Governorate / Al-Diwaniyah district, which is 180 km from the center of Baghdad, and the duration of the experiment was extended from 1/9/2018 to 1/9/2019, the number of cows used in the experiment is 64 of the Holstein cows imported from Germany. To study the relationship between Scalp color and production performance and heat tolerance coefficient, 64 Holstein cows used in this experiment, cows divided into three groups according to the color of scalp cows as the ratio of spotting as 90% black, 50% black-50% white and 90% white, The result of this study showed. The color of the scalp had a significant effect on the milk components, as the color of the scalp exceeded 50% black 50% white over the color of the scalp 90% black, and the color of the scalp 90% white, Was non-significant in other milk components, milk production, and heat tolerance coefficient.