This study aimed to investigate the effect of interaction between total (SCC) and differential somatic cell count (DSCC) on milk yield, composition coagulation traits from individual dairy cows. A 159 224 test-day records (daily traits) have been collected during a period 14 months 12 849 Holstein-Friesian 9275 Simmental cows farmed in 223 herds. The was highly significant for almost all evalua...