- Enzymes of Lalars: Lalars contain lysozyme enzyme. This enzyme destroys bacteria.
- Pancreatic enzymes: Protease enzymes secreted by the pancreas destroy bacteria and fungi.
- Mucous enzymes: Lactoperoxide and lysozyme enzymes secreted from the mucous membrane of alimentary canal and trachea act as bactericides.
- Bile: Bile contains bile. This bile destroys the bacteria.
- Stomach acid: Hydrochloric acid secreted from the stomach wall destroys the bacteria in the food.