The omasum is the third and smallest compartment of the ruminant stomach. The omasum is responsible for water (and a little nutrient) absorption from the feed that came from the rumen. The many folds found in this stomach chamber increases the surface area so that more liquid and nutrients could be absorbed back into the ruminant's body at a faster more efficient rate.
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The omasum is the third compartment of the ruminant stomach. The primary purpose is to remove the water component of the ingesta that was added in the rumen.