Crops absorb livestock antibiotics, science shows

Consumers have long been exposed to antibiotics in meat and milk. Now, new research shows that they also may be ingesting them from vegetables, even ones grown on organic farms.

“Around 90 percent of these drugs that are administered to animals end up being excreted either as urine or manure,” said Holly Dolliver, a member of the Minnesota research team and now a professor of crop and soil sciences at the University of Wisconsin-River Falls. “A vast majority of that manure is then used as an important input for 9.2 million hectares of (U.S.) agricultural land.”

Manure, widely used as a substitute for chemical ... Full Story »

Posted by Dwight Rousu

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Patricia Blochowiak
3.7
by Patricia Blochowiak - Jan. 9, 2009

While this story is definitely very important, it contains enough inaccurate and/or misleading statements that it should be interpreted with great caution. The title, for example, suggests that vegetables may be as significant a source of antibiotic-related problems as the antibiotics fed to livestock, even though 70% of antibiotics in the US are given to livestock, and even though we there is evidence that some of those antibiotics break down during composting, and even though we know that large quantities of those antibiotics are not placed on crops. Nor do we know what percentage of the antibiotics in the soil are absorbed by vegetables or what percentages might be washed off or destroyed by cooking. Another error is in the interpretation of the study regarding antibiotic use and the development of allergies and asthma in children. The study showed a correlation between early antibiotic use and the later development of asthma and allergies, not causation. It is entirely possible that children with undiagnosed allergies and asthma have a higher incidence of antibiotic use in early life. One source states that people don't eat unprocessed corn. One source says that antibiotics are necessary for the health of livestock, even though Europe bans routine use of antibiotics in healthy animals, and even though we know that corn-fed beef have more infections which could be prevented by feeding them a 'normal' diet of grass. Neither of these statements is questioned, even though the authors could have asked other authorities about these assertions.

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