Unlike the true clovers and alfalfa, sweet clover seldom causes bloat;
in fact, with the exception of the summer of 1915, only a few authentic
cases of bloat have thus far been recorded in sections where large
acreages are pastured with cattle and sheep. A number of cases of bloat
wore reported in Iowa during the abnormally wet season of 1915. No
satisfactory explanation for this comparative freedom from bloating
has been offered. It is held by some that the coumarin in the plants
prevents bloating, but this has not been established experimentally.