The staring coat is due to the contraction of the muscles of the hair follicles.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
They generally open into the hair follicles, occasionally on the surface of the body.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Still more conclusive as to the production of such poisons is the fact that the full distention of the milk ducts and follicles, and the consequent driving of the blood out of the udder and arrest of the formation of depraved products, determines a speedy and complete recovery from the disease.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler