For years, farmers have noticed the slobbering of animals after feeding second-cutting red clover hay. Severity of this effect, however, has varied from year to year. Questions asked many times are what causes the slobbering and what can be done about it? To get the answers available, let's go back about 37 years into something which appears to be totally unrelated to slobbering and follow research which has been done on a fungus, which causes a disease of red clover.
Evans, J. Kenneth; Williams, A. S.; and Labore, D. E., "Why Does Second-Cutting Red Clover Hay "Slobber" Animals" (1970). Agronomy Notes. 171.