Usually refers to the black variant of Holstein cattle, which is a dairy cow breed originating in the Netherlands and renowned for its high-yield dairy products. It is one of the most popular dairy cattle breeds in the world, widely raised in dairy farms around the world. Large in size, well proportioned in structure, with strong limbs and wide breasts, it helps support one's weight and provides enough space to accommodate large breasts. Generally gentle and easy to manage in personality, with strong adaptability to caretakers and the environment. It is an efficient dairy producer that can produce a large amount of milk every day, with high milk fat and protein content, suitable for making various dairy products.

Also known as Jersey cattle or Jersey dairy cows, it is a dairy cow breed originating from Jersey, UK. Known for its small size and excellent milk quality, it is one of the oldest dairy cattle breeds in the world. The body size is usually small, with adult cows weighing between 350 and 450 kilograms, having a short body length and compact structure. The milk quality is very high, with higher milk fat and protein content than many other dairy cow breeds, which makes Juan Shan milk more outstanding in making dairy products, especially suitable for making cheese, butter, and high-fat dairy products. Although their milk production is not as good as that of large dairy cattle breeds, their superior milk quality gives them a place in the dairy industry.

It is a large domestic animal belonging to the order Artiodactyla and family Oxidae in the mammalian class. Known for its milk production capacity, it is the main source of global dairy production. Breeding has a long history, as early as ancient Egypt in BC, humans began to domesticate and utilize dairy products from cows. Dairy products are not only nutritious and contain high-quality protein, calcium, and vitamins, but also have a wide range of uses and can be processed into various dairy products such as milk, cheese, butter, etc. The living habits are relatively mild, usually grazing on pastures or raising in captivity. It also holds a place in culture and is often seen as a symbol of diligence and abundance.