Saturday
06Mar2010
Agricultural Antibiotics Break Down Quickly In Soil But Not Water
Researchers with the U.S. Department of Agriculture say that antibiotics given to chickens and cows breaks down fairly quickly in soil but hangs around a bit longer in our nation's ponds, lakes and rivers.
Pharmaceutical antibiotics like oxytetracycline are widely used on beef and chicken farms and scientists have known for some time that at least some of those medicines pass through the digestive system of those animals with their "active" components intact. In other words, farm animals are pooping out "live" antibiotics that can then (at least potentially) contaminate our soils and drinking water supplies.
This isn't such a big deal on farms, where microbes in the soil break down the manure and the antibiotics in it pretty soon after the manure is deposited. But those microbes can't survive as well in lakes, streams and ponds--or in soils that are fully saturated with water. And that means that those pharmaceuticals, which are still "active", break down far more slowly.
The results of the USDA's study was published in the Journal of Agricultural and Food Chemistry.
Pharmaceutical antibiotics like oxytetracycline are widely used on beef and chicken farms and scientists have known for some time that at least some of those medicines pass through the digestive system of those animals with their "active" components intact. In other words, farm animals are pooping out "live" antibiotics that can then (at least potentially) contaminate our soils and drinking water supplies.
This isn't such a big deal on farms, where microbes in the soil break down the manure and the antibiotics in it pretty soon after the manure is deposited. But those microbes can't survive as well in lakes, streams and ponds--or in soils that are fully saturated with water. And that means that those pharmaceuticals, which are still "active", break down far more slowly.
The results of the USDA's study was published in the Journal of Agricultural and Food Chemistry.

March 6, 2010