Question

Which of the following is also known as true stomach of cows?

• A. Omasum
• B. Abomasum
• C. Rumen
• D. Reticulum

Hint:

Remember the order of digestion: Rumen (Fermentation) \(\rightarrow\) Reticulum (Honeycomb/sorting) \(\rightarrow\) Omasum (Water absorption) \(\rightarrow\) Abomasum (True acid digestion).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Ruminants (such as cows, sheep, and goats) possess a specialized, complex stomach divided into four distinct compartments: the rumen, reticulum, omasum, and abomasum.
This anatomical adaptation allows them to digest complex plant cellulose through microbial fermentation.

Step 2: Detailed Explanation:
Let us analyze the function of each compartment:
- Rumen (C): The largest compartment, acting as a massive fermentation vat. It contains billions of anaerobic bacteria, protozoa, and fungi that break down cellulose into volatile fatty acids (VFAs).
- Reticulum (D): Working closely with the rumen, it has a honeycomb-like lining. It traps foreign objects and helps form feed boluses for regurgitation (chewing the cud).
- Omasum (A): Often called the 'manyplies' due to its folded, leaf-like layers. Its primary function is to absorb water, minerals, and residual volatile fatty acids from the digesta.
- Abomasum (B): This is the only compartment lined with glandular tissue that secretes digestive enzymes (such as pepsin) and hydrochloric acid (\(\text{HCl}\)).
Because its chemical digestive environment is identical to the simple stomach of monogastric animals (like humans or pigs), the abomasum is referred to as the "true stomach" of ruminants.
Therefore, the abomasum is the correct answer.

Step 3: Final Answer:
The abomasum is known as the true stomach of cows.