Subjective Type

Explain nutrition in cud chewing herbivore animals

Solution

Ruminants swallow the food without chewing. After feeding, they bring the food from the stomach back into the mouth and chew it leisurely. This process is called rumination and such animals are called as ruminants. Rumination is also called second chewing.

Process of digestion: Grass-eating animals swallow the food quickly and store it in the rumen. Rumen also inhabits cellulose digestic bacteria which establish a symbiotic relationship with the animal stomach.

Digestion in ruminants is a good example of symbiosis.Microorganisms present in the stomach of ruminants help in digesting cellulose and in turn obtain shelter and nourishment form the animal. A symbiotic relationship exists between microorganisms and the ruminants.

As rumen is full, the food is taken into second part of the stomach, the reticulum.

Digestive juices of the reticulum partially digest the food. The partially digested food in the reticulum is called as cud.

While resting, cow brings back the cud into the mouth for regurgitation.

Food is chewed completely and swallowed into omasum for further digestion.

Then the food moves into abomasum for digestion brought about by digestive juices.

A large sac-like structure called the caecum lies between the small and large intestines.

The symbiotic bacteria present in the caecum help in complete digestion of cellulose. Digestion of food is completed in the intestine.

As the symbiotic bacteria are not present in the human digestive system, humans cannot digest cellulose.

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