American scientists reported in the latest issue of "Natural Biotechnology" that the genetically modified cows they cultivated are effective against cow mastitis caused by Staphylococcus aureus infection. If this technology enters the application stage, it can be recovered for the dairy industry. Billions of dollars in losses. Bovine mastitis is a common disease that causes inflammation and swelling of the cow's mammary gland and a significant drop in milk production. This disease has caused the U.S. dairy industry to lose about 2 billion U.S. dollars each year, and the U.K.’s annual losses have reached about 200 million U.S. dollars. Some of the previous technologies are not effective in controlling bovine mastitis and are incapable of attacking the disease caused by Staphylococcus aureus infection. US Department of Agriculture researchers report that in their study, a gene similar to Staphylococcus aureus that mimics staphylococci was implanted into dairy cows to produce a protein called "Staphylococcus." They cultivated five such GM cows and the ability of GM cows to resist S. aureus infection was greatly enhanced compared to ordinary cows. The researchers injected a solution containing Staphylococcus aureus into the mammary glands of transgenic cows and ordinary cows. As a result, the average area of ​​breast infection in GM cows was 14%, while the average area of ​​breast infection in ordinary cows was 71%. The mammary glands of the transgenic cows with the highest number of "Staphylococcus" produced in vivo were found to have no signs of infection. However, the researchers pointed out that this GM cow can only resist bovine mastitis caused by Staphylococcus aureus infection, and it is not necessarily resistant to bovine mastitis caused by other bacteria. In addition, although genetic improvement is a very good technique, it cannot replace other measures to prevent bovine mastitis.
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