A review of the textbooks of anatomy of domestic animals and of man and meat inspection handbooks and various other publications indicate that a variety of terms are used for describing the lymph system.

During rail inspection of hog carcasses in a Sioux City meat packing plant, a carcass was tagged U.S. Retained for further examination.

The most common means of spread of many of the common endemic diseases of swine is by transmission from the dam to her offspring during the first few days of life. In the great majority of cases the swine fetus is free of all organisms until it passes the cervix. Utilizing adequate technique, pigs can be delivered surgically and removed to rearing areas without exposure to swine organisms.