Rumen is a natural fermentor with the strongest ability to degrade fiber substances so far. The chyme inside is divided into three layers (gas layer, dense layer and liquid layer). When ruminating, chyme flows back into the mouth and chews again.

Rumen is located on the left side of abdominal cavity, occupying almost the whole left abdominal cavity, chyme enters through cardia, and after digestion, it enters the net food intake and stomach of tumor.

Characteristics of rumen:

After the rumen contents reached a relatively stable state, its temperature was 38 ~ 465438 0℃, with an average of 39℃. Affected by feed types and drinking water temperature, it also affects feed digestion.

Rumen is a cystic digestive organ, and the volume of adult cattle is about 56.9L, which is slightly flat from left to right and elongated from front to back. Most of them are located in the left half of abdominal cavity, and a few are located in the right half of abdominal cavity.

Rumen is long from front to back, slightly flat from left to right, and there is an obvious transverse groove at both ends, which is called anterior groove and posterior groove respectively. These two grooves extend from left to right, forming left and right longitudinal grooves, which divide rumen into rucksack and abdominal sac. The upper part of the backpack is the rumen vestibule, where the esophagus opens. There is a tumor reticulum in the anterior lower part of the rumen rucksack, which communicates with the reticulum.

Refer to the above content: Baidu Encyclopedia-Rumen