further studies on 85 animals later developing e coli mastitis , and 192 controls , in four friesian herds did not reveal differences in milk fat content ( except as related to yield ) , milk protein or in the interrelationship of days of lactation , milk protein or in the interrelationship of days of lactation , milk fat and milk protein in the two groups .
C0991850
milk fat
C0026138
milk protein