Deposits of tubercle or tumors in the udder, or induration of the gland, may be efficient causes, the irritation caused by milking contributing to draw the blood.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
In cases of threatened induration excellent results are sometimes obtained from a weak-induction current of electricity sent through the gland daily for 10 minutes.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
This is especially valuable when the disease is protracted and induration threatens.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler