1. Holstein cattle: North Holland and Schildon provinces originating in the northern part of the Netherlands. For nearly a century, due to the different orientations of Holstein cattle breeding in various countries, the countries of the United States, Canada, Israel and other countries have been bred as representatives. There are two types of milk and meat, milk and meat, represented by European countries such as the Netherlands, Germany, Denmark, Sweden, and Norway.
Appearance characteristics: tall body, well-proportioned structure, thin skin and thin skin, less subcutaneous fat, especially large breasts, obvious milk veins, well-developed hindquarters compared to the front, wedge-shaped sides, with typical milky appearance, short hair, The coat is black and white, with clear boundaries and white stars on the forehead.
Lower abdomen, lower extremities and tails are white. The live weight of the adult bull is 900-1200 kg, the weight of the cow is 650-750 kg and the body height is 135 cm. Yak weighs 40-50 kg.
Production performance: Dairy Holstein cows have the highest milk yield among dairy cow breeds. In the United States, Holstein cattle registered in 2000 had an average milk yield of 9777 kg, a milk fat percentage of 3.66%, and a milk protein ratio of 3.23%. The disadvantage of Holstein is the low milk fat content, heat resistance, and a significant drop in milk production at high temperatures.
2. Yak: A small, milky breed native to Yeouido in the southern section of the English Channel.
Appearance characteristics: small size, handsome, clear outline. The head is small and light, the distance between the two eyes is wide, the eyes are large and bright, the forehead is slightly sunken, the ears are large and thin, the armor is narrow, the shoulders are upright, the chest is wide and wide, the back is straight, the abdomen is large, and the jaws are flat and wide. The tail is slender, the limbs are thin, the joints are obvious, and the hoofs are small. The breasts are well-proportioned and have beautiful shapes. The milk veins are thick and curved. The hindquarters are more developed than the front, and the body forms a wedge. The live weight of the adult bull is 650-750 kg, the weight of the cow is 340-450 kg and the body height is 113.5 cm. Yak weighs 23-27 kg.
Production performance: Yak's greatest feature is its thick milk, high milk production per unit weight, large milk fat balls, easy separation, yellow butter, good flavor, suitable for making butter, and its milk and dairy products are popular. The average annual milk production is 3500 kg, the milk fat percentage is 5.5%-6%, and the milk protein rate is 3.7%-4.4%. Calves are more heat-resistant, and they are kept in India, Sri Lanka, Japan, New Zealand, and Australia.
3. Aier Xia Niu: A medium-sized milk breed originating from Ershire, England. The cattle were originally of the meat type. In 1750, the introduction of Holstein cows, more racing cows, calves, and other dairy breeds was improved and hybridized. At the end of the 18th century, it was used as a dairy variety. Aier Xia Niu is characterized by its early maturity, coarseness and adaptability. It has exported to more than 30 countries including Japan, the United States, Finland, Australia, Canada and New Zealand. China's Guangxi, Hunan and many other provinces and cities had
There are introductions, but due to the variety of spirits, it is not easy to manage, and now there are few purebred cattle.
Appearance characteristics: Slender angle, beautiful shape, the corner of the root protruding outwards, one by one upward bending, the tip slightly bent back, the wax color, black tip. Medium body, well-balanced structure, coats are red and white, and some cows are white. The important feature of the appearance of the variety is its peculiar angular shape and small patches of red spots or red and white yarns. Nose mirror, light red eyes, tail white. The breasts are well-developed, well-developed and square, and the nipples are medium-sized and the milk veins are obvious. The adult bull weighs 800 kg, the cow weighs 550 kg and has a height of 128 cm. Calves weigh 30-40 kg.
Production performance: the United States registered the average milk production in the Year of the Ox, 5448 kg, milk fat rate 3. g%. Individuals with high yields reached 7,718 kilograms, and the milk fat percentage was 4.12%.
4. China Holstein: Originally known as "Chinese Holstein", the purebred Holstein introduced from abroad has long been crossbreed and breeded with local cattle. It is the most important dairy breed in China.
Appearance characteristics: the body is meticulous and meticulous, the structure is well-proportioned, the coat color is black and white, the flower slice is clear, the forehead has white spots, the abdomen, the lower extremities below the knee joint and the tails are white. The breasts are well-attached, have a soft texture, a clear milk vein, and a nipple size and distribution.
Production performance: The average milk yield of adult cows is 4774 kg, the average milk fat percentage is 3.4% or more, and the milk yield of individual high-yielding cattle has exceeded 8000 kg. In general, the milk production in the north is relatively high, averaging 5,000 to 6,000 kilograms. Due to the hot climate in the south, the milk production level is relatively low, averaging 4,500-5,500 kilograms.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
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