noun (plural abomasa /-sə/)Zoology
The fourth stomach of a ruminant, which receives food from the omasum and passes it to the small intestine.
- Rennet is derived from the abomasum (fourth stomach) of newly born calves.
- The usual source is the lining of the fourth stomach (the abomasum or true stomach) of a calf, though other young animals may be used.
- This ensures that during suckling milk is channeled directly to the abomasum bypassing wasteful ruminal fermentation.
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