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Detection of Early Malignant Lymphoma in Slaughtered Cattle¹

Department of Veterinary Surgery and Medicine, Department of Pathology, School of Veterinary Medicine, Michigan State University, East Lansing, Michigan

A 12-month study was conducted in 2 small slaughterhouses to determine the extent to which cattle with malignant lymphoma² were passing meat inspection. Meat inspectors were requested to submit lymph nodes that appeared abnormal as to size, color, or consistency.

A total of 2843 dairy animals³ and 6791 beef animals was inspected on collection days. Lymph nodes were submitted from 736 cattle.

Four dairy cattle were found to have malignant lymphoma following the histopathologic study. Two of these cows with extensive lesions were condemned by the meat inspectors. The other 2 animals, each with one abnormal lymph node, were passed for human consumption.

¹ Supported by USPHS Grant CA07839-02, from the National Cancer Institute.

² Other terms frequently used are leukosis, lymphoblastoma, lymphosarcoma, leukemia, and lymphocytoma.

³ Steers of the dairy breeds were classified as beef animals.

Received 5/11/66. Accepted 9/20/66.