Topics: Animal Physiology, Animal Refresher

Absent Stomach Chamber in Pseudo-Ruminants

Question

In pseudo-ruminants like camel & llama, which part of the stomach is absent-

Select an answer

In pseudo-ruminants like camel & llama, which part of the stomach is absent-

  1. Rumen
  2. Reticulum
  3. Omasum — Correct Answer
  4. Abomasum
Explanation:
Correct Answer: Omasum

Pseudo-ruminants (Camel, Llama, Alpaca, Vicuna) have only 3 stomach chambers — the Omasum is absent.

Stomach Chambers by Animal Type
  • True ruminants (Cattle, Buffalo, Sheep, Goat, Deer, Yak, Mithun, Giraffe, Nilgai): 4 chambers — Rumen + Reticulum + Omasum + Abomasum
  • Pseudo-ruminants (Camel, Llama, Alpaca, Vicuna): 3 chambers — Rumen + Reticulum + Abomasum (Omasum absent)
  • Monogastrics (Horse, Pig, Dog, Cat, Rabbit, Elephant): 1 chamber
Stomach Chamber Nicknames
  • Rumen = Paunch (largest)
  • Reticulum = Honey comb / Tool box (smallest)
  • Omasum = Many-plies / Book stomach
  • Abomasum = Rennet bag / True stomach
Other Pseudo-Ruminant Facts
  • Gall bladder is also absent in pseudo-ruminants AND horse
  • Pseudo-ruminants can ruminate (chew cud) despite having only 3 chambers

📚 About this Topic — Animal Physiology

This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.

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