First, "Traveling in the Cow's Belly"
The full text of "Traveling in the Cow's Belly" is mainly about "a trip in the Cow's Belly". Qingtou and Hongtou, two little crickets, are very good friends. When they were playing hide-and-seek, Hongtou was accidentally eaten by a big ox. Its little friend, Qingtou, was brave and resourceful, while comforting Hongtou not to panic, he tried his best to save his little friend. Finally, Hongtou was saved.
Second, expand the information
1, ruminating
Rumination mainly occurs in some herbivores of the order Artiodactyla. The stomachs of the suborder Artiodactyla (cattle, sheep, deer, etc.) are divided into four parts: rumen, reticulum, flap stomach and abomasum. The first three stomachs have no gastric glands, and their overall function is to ferment, filter, grind and roughly absorb nutrients. Only abomasum is the part that secretes gastric juice, which is equivalent to that of monogastric animals, also known as abomasum.
The volume of rumen is100-300 liters, accounting for about 80% of the four-part stomach. 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 reticulum is in front of the rumen, against the diaphragm and liver. The inner wall of reticulum is honeycomb, and microbial digestion is also carried out in reticulum.
2. Appearance characteristics of cattle
The common feature of cattle is that they are physically strong; Have legs suitable for long-distance running; There are 4 toes on the feet, but the lateral toes are more degraded than deer, which is suitable for running; The incisors and canine teeth have degenerated, but the lower incisors remain, and the lower canine teeth are toothed in Yemen. The three pairs of incisors are inclined forward in the shape of shovels. Because they feed on hard plants, the premolars and molars are high crowns, and the enamel is wrinkled. After the crown is abraded, complex tooth patterns are formed on the surface, which is suitable for grazing.
In order to store forage and avoid enemies, their stomachs have evolved into four chambers: rumen, honeycomb stomach, flap stomach and glandular stomach, and they also have the habit of "ruminating", so that food can be better digested and absorbed. More importantly, their horns are extremely different from deer.
Usually, after 1 year, there are a pair of thick horns on the skulls of male and female animals. The shapes of the horns are different from each other, but they are symmetrical bone branches derived from the protrusion of the frontal bone. There is a layer of horny sheath outside, which can be taken off, and the inside of the horn is hollow, so it is also called "cave horn", and cattle animals are also called "cave horn" animals.