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Reduction of pollution of green manure in transgenic pigs
According to the latest study, genetically engineered pigs carrying bacterial genes produce cleaner, less polluted green manure. These genes help pigs remove phosphates from foods, which can help reduce agriculturally harmful waste from pig husbandry. Serge Golovan, a member of the Pig Research Group at the University of Guelph in Canada, said: "Plants contain many organic phosphorus, which cannot be used by ordinary pigs." Unabsorbed phosphorus flows through the environment and harms the creatures in the stream. The pig is genetically modified to produce phytase in saliva that can absorb phosphorus from the plant, whereas ordinary pigs cannot digest phosphorus. Analysis of the fertilizers produced by the transgenic pigs revealed that they had a 75% reduction in the amount of phosphorus discharged from the pigs. Pigs are usually supplemented with phosphorus. However, for transgenic pigs, there is no need to add phosphorus to the feed, because they can use almost all of the phosphorus in the soybean feed, while ordinary pigs can only use about half. With the growing prosperity of pig husbandry, phosphorus pollution has become a serious problem. In some regions of the United States, "Phosphorus levels in the soil are increasing," said Joe Rudek, a scientist at the North Carolina Environmental Protection Group. "This will become a serious problem." Rudek said using genetically modified pigs to reduce agriculture Pollution "may be a little fuss," because pigs used for human consumption contain bacterial genes that cause food safety problems. He said that removing the phosphorus from green manure and converting them into useful substances, such as a nutritional supplement for fish, would be a better way. Ordinary pigs cannot digest the phosphorus in the plant. They assemble the compound inositol hexaphosphate in pigs. Recently, phytase extracted from soil microorganisms has been added to the commercial pig feed to increase digestion of phytate by pigs. However, the Guelph team used the phytase gene from E. coli and was 10 times more efficient. The gene was inserted into the porcine genome and this enzyme was produced in the pig's saliva. The less polluted pigs excrete much less phosphorus than pigs that eat phytase. Previously, the team led by microbiologist Cecil Forsberg also conducted a similar study on rats. Harry Gilbert, an agricultural biochemist at the University of Newcastle in the United Kingdom, said: “This is a very important study. It shows that transgenic animals have a beneficial effect on the environment. These two aspects can go hand in hand.†Putting a high-potency phytase Adding to the feed produces the same benefits. But this method is very expensive. Golovan believes that genetically modified pigs may be cheaper in the long run. He said, "Cultivating genetically modified pigs is more expensive, but it is the same as normal pigs."
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