The road map for the third-grade China people to travel in the cow's stomach is to be caught in the cow's mouth, come to the first stomach, come to the second stomach and return to the cow's mouth.

Travel in the belly of a cow

Traveling in a Cow's Belly is a book published by china welfare institute Publishing House in 2006 by Zhang Zhilu. The full text mainly talks about "a trip in the belly of a cow". The travel route of The Red Head in the Cow's Belly contains the scientific knowledge of rumination.

Qingtou and Hongtou, two little crickets, are very good friends. When they were playing hide and seek, the red head was accidentally eaten by a big cow. His little friend is young, brave and resourceful. While comforting Red Head not to panic, he tried his best to save his little friend. Finally, Red Head was saved.

Knowledge expansion:

Rumination, commonly known as backward chewing, refers to some animals returning semi-digested food from the stomach to the mouth to chew again after eating for a period of time. Rumination mainly occurs in some herbivores of Artiodactyla, such as cattle, sheep and antelope. These animals are collectively called ruminants and belong to Artiodactyla, a suborder of ruminants. In addition, primate proboscis monkeys also ruminate.

Rumination mainly occurs in some herbivores of Artiodactyla. The stomach of Artiodactyla is divided into four parts: rumen, reticulum, flap stomach and abomasum. The first three stomachs have no gastric glands, and their overall functions are fermentation, filtration, grinding and rough absorption of nutrients. Only abomasum is the part that secretes gastric juice, which is equivalent to the stomach of monogastric animals, also called abomasum.

The rumen volume is 100-300 liters, accounting for about 80% of the four stomachs. Rumen contains a large number of microorganisms, including protozoa (mainly ciliates) and bacteria. Rumen itself does not secrete enzymes, and all enzymes in rumen are produced by microorganisms. The omentum is in front of the rumen, against the diaphragm and liver. The inner wall of the reticular structure is honeycomb, and microbial digestion is also carried out in the reticular structure.

Ruminants generally eat in a hurry, especially roughage, which is mostly swallowed into the rumen without full chewing. Food is soaked and softened in rumen for a period of time, then retches and returns to the mouth, after chewing, it is mixed with saliva again and swallowed into rumen again.