2002 Volume 55 Issue 4 Pages 209-214
Five postpartum Japanese Black cows were first given low-starch feed then 3kg/day of corn silage. As a result of this regimen, all calves showed premonitory signs in the feces 1-3 days following the administration of silage to their dams. The calves contracted aqueous white scours after the dams began eating silage. Total numbers of protozoa in dams' rumen doubled the day after the occurrence of premonitory signs in calves. As to dam blood components, triglycerides increased on the day on which calves demonstrated premonitory signs; and phospholipids and beta-hydroxybutyric acid were high on the day before the calves contracted white scours. On the day on which white scours developed in calves, triglycerides, glucose, and urea nitrogen increased in dams. These findings suggest that change in dams' feed causes blood component changes that influence their milk components, finally resulting in their calves' contracting white scours.