At present, the dairy cattle breeding industry has a good momentum of development. The enthusiasm of the farmers for raising dairy cows is very high. This has led to a gradual increase in the price of dairy cows. Under the drive of interests, some people who have lost sight of their interests have acted as good cows. The diseased cattle are used as healthy cows and sold at high prices. In addition, the farmers do not know enough about the knowledge of dairy cows and cause great economic losses to some farmers. Now we will introduce some issues that need attention when buying dairy cows.
One, variety
At present, the most popular breed in China is black and white cows. Black-and-white cows are known for their long lactating periods and high milk production. This breed has the following characteristics:
Look from the coat color: for black and white flowers, there are large, well-defined black patches on the white hair, black and white each occupy about half;
From the point of view of body size, the skin is thin and thin, the blood vessels are exposed, the hairs are short and shiny, the body muscles are not well developed, and the hindquarters and the breasts are well-developed and robust;
From the perspective of local characteristics, the head is long and narrow, with large eyes, long neck and neck, multiple wrinkles on the side of the neck, underdeveloped crest, large abdomen without sagging, curved ribs, large intercostal spaces, and a straight topline.
For high-yield dairy cows, the front breasts should extend forward to the front of the abdomen and lumbar horns. The rear breasts are filled in the femora and protrude from the rear of the body. The four-milk areas and nipples should be well-proportioned, and the nipples are cylindrical and about 7-9 cm long. Nipple spacing is wide. The whole breast is well attached and has a "bath-like" shape with a slightly higher shading than the hock. The breasts should have thin and detailed skin, short and sparse fine hair, curved and obvious milk veins, wide and large mastops, thick and deep wells.
The purchase of dairy cows requires that some people have poor quality, poorly developed dairy cows, and act as good dairy cows to defraud the purchaser. Therefore, purchases should be made as large as possible to purchase large dairy farms, and at the same time check the pedigrees of the dairy cows as much as possible to infer their production. performance.
Second, age
The adaptable age of dairy cows is between 14 and 18 months, and the high-yield period is between 3-6 fetuses. Afterwards, the milk production is decreasing year by year as the number of births is increased. Care should be taken not to buy dairy cows that are frail and frail, but care should be taken if the cows are larger than After 18 months, she was not pregnant and she did not have any estrus. She should pay special attention to suffering from reproductive system diseases. Such cows should not be purchased.
Third, the epidemic situation
Dairy cow tuberculosis and brucellosis are two kinds of zoonosis that seriously endanger human health. At present, China adopts a strict elimination system for tuberculosis and brucellosis in dairy cows. It is monitored twice a year and harmless to cattle that are positive for monitoring. Processing. However, some people disregard the laws of the country and collude with some dairy farms to obtain benefits from the sale of dairy cows that are positive for monitoring. At the time of purchase, veterinary technicians must be on site to monitor and must not purchase cows that are positive for the monitoring results.
In addition, special attention must be paid to cow mastitis. Mastitis is a common disease of dairy cows, which seriously affects milk production, milk quality and drinking safety of dairy cows. In clinical mastitis, breast milk is generally thin, leaky, grayish-white, and the breasts are swollen, red, hard, and produce less milk. Recessive mastitis, naked eye breast milk without exception, but the milk biochemical and bacteriological changes have taken place. Therefore, when purchasing dairy cows, if the conditions permit, the relevant departments should check the milk to determine if they have subclinical mastitis. Obvious mastitis symptoms and subclinical mastitis should not be purchased.
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