What is the reason for the complex structure of the stomach in ruminant cloven-hoofed animals?

In ruminant cloven-hoofed animals that feed on plant foods, the stomach consists of four sections (chambers): the rumen, the net, the book, and the abomasum. In the first three chambers, special groups of bacteria and ciliates live, which destroy the cell wall of plants by fermentation. Without the participation of these microorganisms, the plant cell wall would remain undigested. In the last section – the abomasum – the protein part of the food is digested under the influence of acidic gastric juice.

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