This sentence refers to the twelve zodiac signs of China, namely, rat, ox, tiger, rabbit, dragon, snake, horse, sheep, monkey, chicken, dog and pig. As the proverb in China's traditional culture describes, "The zodiac has great achievements".

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Bovini (scientific name: Bovini) is an animal family under Artiodactyla, Bovidae and Bovidae, commonly known as "Bovine", which has 5 genera. Most of them are giant herbivores. These include African buffalo and American bison, yellow cattle, buffalo, yak and so on, which are very important to human beings. They are physically strong, and their necks, shoulders or backs are often raised by the spinal dorsal spines, and they are muscular.

Have legs suitable for long-distance running; There are four toes on the foot, but the lateral toes are more degraded than the deer; The front teeth and canine teeth are degenerated, and complex tooth patterns are formed on the crown surface after wear, which is suitable for grazing; The stomach has four chambers, and the ruminant function is perfect.

Adult men and women have cavity angles, which are symmetrical bone branches derived from frontal protrusion. They are not bifurcated, hollow inside and covered with detachable horn sheaths. After the cavity corners are removed, they can no longer grow. Generally, when it grows to a certain extent, it will stop growing and the horny sheath will not be replaced.

move

Wild cattle belong to the subfamily Bovine, including 9 species of pronghorn, 2 species of four-cornered antelope and great blue antelope distributed in Asia. The relationship between ethnic groups is different when studying the development history of ethnic groups. Most molecular studies support that bovine subfamily can be divided into two categories, namely cattle and gazelles. This also has some morphological support, the most obvious is that both types have pedicled horn nuclei.

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The chromosome number of cattle varies from species to species, and sometimes even from subspecies, so it is necessary to further study the taxonomic purpose. The ancestor's Y chromosome may be a small proximal centromere chromosome, but it has evolved into several different characteristics. The buffalo subfamily obtained X-specific repetitive DNA sequences on its Y chromosome.

Cattle have a metacentric Y chromosome and share a metacentric X chromosome with bison. The diploid number 2n of the selected species is listed below.