The life histories of the various small roundworms occurring in the intestines of cattle, so far as they have been worked out, are very similar to that of the twisted stomach worm as described on page 519. Treatment for intestinal roundworms.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
A number of species of small roundworms, varying in size from an eighth of an inch to an inch or more in length, occur in the intestines.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Several species of roundworms may occur in the fourth stomach.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler