| Vegetable Crops Medicated by Manure |
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| Written by Heather McKee | |
| Monday, 02 February 2009 | |
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In the late 1940s, producers discovered that chickens fed the pharmaceutical byproducts of the antibiotic tetracycline grew faster than other chickens. Since then, producers have rampantly mass-medicated livestock to allow for overcrowding and to increase growth rates. Over 25 million pounds of antibiotics are used in livestock production in the United States annually. Of course, we've been ingesting some of those antibiotics too, by drinking and eating the milk and meat from these animals. What we didn't realize is that we may have also been ingesting those antibiotics in our vegetables. A new University of Minnesota study shows that vegetable crops fertilized with manure from medicated animals absorb the antibiotics right along with the nutrients. In the leaves of green onion, cabbage, and corn crops treated with manure, the livestock antibiotics chlortetracycline and sulfamethazine appeared. The antibiotics appeared at far less than prescription dosages, and the heavy processing of some vegetables (like corn) may break down some of the antibiotics, but in unprocessed vegetables antibiotics are likely to appear on the dinner table. Constant exposure to antibiotics leads to antibiotic resistance in humans and in bacteria. Using manure instead of fossil-fuel based fertilizers is common for organic producers, and manure is used to fertilize over 9 million acres of agricultural land in the United States. The study pointed out that manure management is key to keeping antibiotics out of vegetable crops - composting the manure at high temperatures broke almost all of them down.
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It's true what our moms said...we are what we eat. In fact, it's truer than they thought. What I eat doesn't just affect me anymore, it affects all of us.
Unfortunately, the story of food can sometimes be complicated. But envirovores help each other out...which is why this blog will be bringing you news, tips, and information about food and the environment every step of the way.
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