Antibiotics ward off diseases, and low levels of certain antibiotics may also be fed to livestock to improve their growth. However, much of the antibiotics fed to livestock goes to waste.
“Often, 90% or more of the antibiotic is excreted, according to previous studies,” according to University of Manitoba researcher Francis Zvomuya. “Manure containing these is then used as fertilizer on crops.”
Once applied with manure to crops, those antibiotics are in the natural environme
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