Cattle have four stomachs: braided stomach, rumen stomach, rumen stomach and reticulum stomach, of which the rumen stomach can secrete gastric juices, which is equivalent to the stomach of a monogastric animal, and is the real stomach. The following is a detailed explanation:

The cow stomach consists of four parts, namely, rumen stomach (the first stomach, also known as the grass stomach), reticulum stomach (the second stomach, also known as the honeycomb stomach), petal stomach (the third stomach, also known as the heavy petal stomach or the hundred-leaf stomach), and wrinkled stomach (the fourth stomach, also known as the true stomach). The first, second and third stomachs, collectively known as the antrum, have no gastric glands and cannot secrete gastric juices; the fourth stomach can secrete gastric juices and is equivalent to the stomach of a monogastric animal.

The wrinkled stomach, also known as the true stomach, accounts for 8% of the total volume of the four stomachs, and its role is the same as that of the stomach of monogastric animals, which can secrete digestive juices and digestive enzymes to digest undigested feeds in the rumen and rumen microbes that enter the true stomach along with rumen chow.

Functions of the other three stomachs of cattle:

1, rumen accounts for 80% of the total volume of the four stomachs, there is a large number of microbial growth and reproduction, and a large part of the feed is digested here.

2, mesh stomach accounted for 5% of the total volume of the four stomachs, its function is like a sieve, will be eaten with the feed into the heavy objects such as nails, wire, etc. to stay in it.

3. The braid stomach accounts for 7% of the total volume of the four stomachs and mainly absorbs water from the feed and squeezes and grinds the feed.

Reference: Baidu Encyclopedia - Cattle