This symptom is more noticeable when the animal Coughs.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
If the cow Coughs, the head must at once be lowered to permit the fluid to escape from the larynx.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
It is compressed, and the animal Coughs unwillingly and with evident pain.
"Cattle and Cattle-breeders"
William M'Combie