How many jin of milk does a cow usually produce a day? Why can you keep producing milk? What are the milking methods?

Milk is one of the oldest natural drinks, known as "white blood", is squeezed from female cows. There are different grades of milk in different countries. So how many jin of milk does a cow usually produce a day? Why can you keep producing milk? What are the milking methods?

How many jin of milk does a cow usually produce a day?

1. The milk yield of Holstein is the highest of all dairy breeds. The average milk yield of cows is 7500-8500 kg, and the milk fat rate is 3.5%-3.8%.

2. In 1979, the American Dairy Cow improvement Association registered 128570 heads with an average milk yield of 10790 kg and a milk fat rate of 3.64%.

3. In 1980, there were 439 cows from Lu'an Farm in California, with an average milk yield of 10790 kg and a milk fat rate of 3.5%. The Holstein herd with the highest milk production in the United States. 4. The world individual milk yield record is also a Holstein cow in the United States with a milk yield of 32375.5 kg in 365 days, with an average daily yield of 88.7kg. The other cow produced a total of 27900 kg of milk in 365 days, with a milk fat rate of 4.1%.

5. The record holder of the highest lifetime milk yield in the world-American cow No. 289 has a lifetime milk yield of 189000 kg, an average milk fat rate of 3.14%, and a total lactation day of 4796 days.

6. according to the analysis of people in the industry, there are generally three stages of milk production every year, namely, the period of stopping milk, the peak period and the period of light milking. the period of stopping milk is usually about 90 days, which is before the cow gives birth, and the peak period of milk production can only last for more than 3 months. the time is after the cub; the other time is the light milk period. The milk production of dairy cows is different in different periods, and there is no milk production at all during the milk cessation period. during the peak milk production period, the daily milk yield of a cow is generally more than 25 kg, and the milk yield of a better cow can reach about 40 kg. At this time, the milk yield of a cow is generally between 5 kg and 20 kg a day.

Why can cows keep producing milk?

1. Cows do not stop giving birth, there is no species that does not give birth to milk, and milk is for the next generation to drink. After sexual maturity, the young dairy cow is pregnant by artificial insemination (the dairy farm buys a tube of ballpoint pen-like semen from the breeding station and injects it into the vagina with an insemination gun). After giving birth to the calf, the milk production period is very long, until artificial insemination again. Pregnancy gives birth to milk.

2. The calf cannot drink breast milk after it is born. The calf is basically killed to make all kinds of biochemical or industrial products except those reserved for breeding bulls, and the heifer is left to continue to produce milk. The milk that the calf drinks is the cow that is sick or the milk is not good, take in the bucket to add feed to feed.

What are the milking methods for cows?

1. Scrub and massage the breasts. First, scrub the breasts with 40-50 ℃ warm water. One side massage and one side massage were adopted respectively for breast massage.

2. Manual milking technology adopts pressing method (fist holding method) milking, which is required to press 80 times 120 times per minute. The whole milking process needs to be completed in 5~8min.

3. The machine milking removes the milk collector with the milk cup from the milk jar, holds the four tubes and the milk delivery tube on the milk collector with the other hand, then turns on the inlet switch on the milk jar, quickly puts the milk cup on the nipple, and adjusts the pulsator frequency to between 40 and 60 times ∕ min to start milking.

During milking, the milk flow can be observed through the peeping glass tube on the milking machine. If there is no milk flow through, or the breast has become soft, turn off the switch on the milking bucket or vacuum tube. After each milking, clean all the parts that the milk passes through in time.