1. Rumen:
* Function: Largest compartment where feed is first stored and fermented by microbes (bacteria, protozoa, fungi).
2. Reticulum:
* Function: Also known as the hardware stomach because it helps filter ingested foreign objects like wire, nails.
3. Omasum:
* Function: Absorbs a significant amount of water, minerals, and volatile fatty acids.
4. Abomasum:
* Function: True gastric, acidic compartment similar to the monogastric stomach: Secretes enzymes & acid for digestion; absorption occurs here.