Which tissue is not listed as an SRM for cattle regardless of age?

Which tissue is not listed as an SRM for cattle regardless of age?

• A. Brain
• B. Tonsils
• C. Distal ileum
• D. Liver

Answer: (D)

SRMs are tissues that could harbor prions from bovine spongiform encephalopathy and must be removed from the food supply. The list changes with age because prions show up in different tissues as cattle grow. Brain is an SRM at all ages because it’s a central nervous system tissue where prions concentrate. Tonsils are also SRM due to their lymphoid role and prion presence. Distal ileum is an SRM in older cattle since prions can be found in gut-associated lymphoid tissue with age. Liver is not designated as an SRM for cattle at any age, so it isn’t on the SRM list regardless of age.

SRMs are tissues that could harbor prions from bovine spongiform encephalopathy and must be removed from the food supply. The list changes with age because prions show up in different tissues as cattle grow. Brain is an SRM at all ages because it’s a central nervous system tissue where prions concentrate. Tonsils are also SRM due to their lymphoid role and prion presence. Distal ileum is an SRM in older cattle since prions can be found in gut-associated lymphoid tissue with age. Liver is not designated as an SRM for cattle at any age, so it isn’t on the SRM list regardless of age.