Sorry, I’m comparing a cows body with its heart and skin to keep out pathogens and immune system to protect it and mouth to ingest nutrients, vs a steel bioreac

Sorry, I’m comparing a cows body with its heart and skin to keep out pathogens and immune system to protect it and mouth to ingest nutrients, vs a steel bioreactor with steel skin and piped nutrients and a clean room/disinfectant for an immune system. I’m not talking about cow milk