A dairy cow is a kind of dairy cattle, which has been highly bred. Milk has comprehensive nutrition, is suitable for long-term drinks, and is also an important raw material in the modern dairy industry.

The head of the cow is well-defined and slightly long. The neck is thin and wrinkled. The whole body structure is symmetrical. Hindquarters are more developed than forequarters.

With the poor heat resistance and higher requirements for feeding and management. There are nearly 100 cow breeds in the world, among which the most famous are black and white cattle.

Cows are native to Holland. Its hair color is black and white. Cattle are easy to domesticate.

After long-term terroir domestication and systematic breeding or crossbreeding with local cattle, black and white dairy cows with different characteristics adapted to local environmental conditions were bred.

Adult cows are 143-147 cm tall and weigh 900-1200 kg, while purebred cows are 130-145 cm tall and weigh 650-750 kg.

Dairy cows in key breeding farms can produce more than 7,000 kilograms of milk a year. Even some cows can produce more than 10,000 kilograms of milk in one lactation period (305 days).

The main breeds of dairy cows in the world are Holstein, SAN SAN cattle (light yellow or tan coat), Genesis cattle (yellow or brown coat, with white spots), Alexia cattle (white and pink or dark red coat, mostly white from the forehead to the bridge of the nose), etc.

Holstein is the main breed of dairy cattle in most countries, which makes the varieties of dairy cows more and more simple and large.

Holstein cows have the characteristics of high milk yield, high feed reward for milk production, and fast growth and development, which are favored by dairy breeders in various countries.

The proportion of Holstein cows raised in dairy herds is increasing, while other dairy breeds are decreasing.

Holstein cows account for more than 90 percent of all dairy cows in the United States and Japan, and 64 percent in the United Kingdom. Holland, New Zealand, Australia, and other countries are mainly developing Holstein cattle.

Holstein cows are black and white. Some people misinterpret it as their protective color. However, this is not true. White is not a protective color, but the evidence that the cow was domesticated.