[Biology Class Notes] on Ruminant Digestive System Pdf for Exam

Ruminants are mammals that eat plants. The most well-known fact about these animals is that they have four-chambered stomachs that help them digest food. This process through which these ruminants extract nutrition from the food they consume is known as rumination. 

Examples of ruminants are Cows, Sheep, Buffalos, Yaks, Giraffes, and Deer.

We see cows chewing their food for very long periods. This happens because Ruminants are animals who can ferment the eaten food, regurgitate it, and chew it again through rumination.

The way their food digests is entirely different from the human digestive system.

The way our digestion happens is a process where we eat food through our mouths. It goes through the food pipe, stomach, and intestine. 

However, for Ruminants, the process is not this way.

The Ruminant Digestive System

Let us discuss the Ruminant Digestive System.

Ruminants are animals that chew and swallow their food, and this process is the same as us, which is the first stage of their digestion.

Ruminants always eat different parts of the high fiber plants like the leaves and the grass.

As these parts are high fiber, they are more challenging to digest. This is a situation where the Cellulose Enzyme helps these ruminants digest all the fiber contents.

As animals cannot create these enzymes themselves, they need a different system to digest plant products.

Among the four stomach chambers in a Ruminant, ‘Rumen’ is the most important. Rumen is the stomach chamber that helps these animals digest the plant food’s high fiber content.

Hence, the rumen function is vital for a Ruminant to complete its digestion correctly.

Structure of a Ruminant Digestive System

We need to understand the structure of the digestive system of a Ruminant to clear our concept of the process behind it.

The digestive tract of a Ruminant includes these organs:

1. Rumen: The most significant part of the stomach, Rumen, can hold about 50 gallons of partially digested food at any time. It contains enzymes that digest the food easily for a Ruminant animal. These enzymes break down the fibrous food and its cellulose. The food often spends 15-48 hours coming in and out of the Rumen as it is swallowed, chewed, regurgitated again and again until it goes to the next part of the stomach, the Reticulum.

2. Reticulum: The Reticulum is the part of the stomach that catches anything the Ruminant should not have eaten. The Reticulum catches things like rocks, plastic, or wire. It also makes the eaten grass softer so that it is easier to digest.

3. Omasum: This part filters the food, squeezes out the water, and further breaks down the eaten food.

4. Abomasum: This part of the stomach is at the end and completes the entire digestion process. It passes the vital nutrients to the animal’s bloodstream and sends the rest to the intestines.

Test Your Knowledge

1. What is the Structure of a Ruminant Stomach?

a. 2-chambered.

b. 3-chambered.

c. 4-chambered.

d. single-chambered.

Ans: c. 4-chambered. The four chambers of the ruminant stomach are the rumen, reticulum, omasum, and abomasums. 

2. Tiger and Cow are Examples of Ruminants. Is it Correct?

Ans: No. The correct two examples of ruminants can be cows and sheep.

3. What are Ruminant Animals?

Ans: Ruminant animals are those who consume plant products as food.

Process of Digestion in Ruminants

The ruminant digestive system starts by chewing and gulping food. These animals don’t chew their food completely. They consume the maximum amount of food possible and swallow it. Ruminants have adopted this process to save themselves from predator attacks while collecting food. 

Rumen and reticulum, two chambers of their stomach, start the digestion process by softening the consumed food. After that, microbes in the rumen produce an enzyme called cellulase. This enzyme helps in digesting cellulose present in plant products.

This way, all the nutrients such as proteins, vitamins, organic acids, etc. are absorbed by the animals into their bloodstream. However, coarse plants that remain to be digested move to the further chamber for further breakdown. In this chamber, the food transforms into chunks known as cud.

This cud is transferred back to the mouth of ruminants for regurgitation. In this process, these animals again start chewing cud. Ruminants’ saliva helps accelerate the digestion process. Once the chewing process is completed, food enters the omasum bypassing the first two chambers of the stomach. 

In this chamber, the food is further processed and passed to the last chamber called abomasums. After completing the final digestion, this chamber passes the food to the intestine. 

If you want to learn more about the ruminant digestive system, or about any other topic of biology, go through the course materials available on our website today. You can also download the app for further materials about the ruminant digestive system.