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- Smith, Philip N., et al. Show all 6 Authors
- Agriculture, ecosystems & environment 2018 v.252 pp. 14-21
- air; beef cattle; chlortetracycline; estradiol; estrone; feedlots; groundwater; land application; monensin; oxytetracycline; particulates; playas; risk assessment; runoff; sediments; semiarid zones; steroid hormones; tylosin; veterinary drugs
- ... Veterinary pharmaceuticals from beef cattle feedyards have, with increasing frequency, been identified as contaminants in aquatic systems. Transport of these pharmaceuticals has generally been assumed to be via manure land application, surface runoff, or groundwater percolation. However, veterinary pharmaceuticals in airborne particulate matter downwind of beef cattle feedyards have recently been ...
- Smith, Philip N., et al. Show all 5 Authors
- Agriculture, ecosystems & environment 2015 v.203 pp. 29-35
- beef cattle; estradiol; estrogenic properties; feedlots; growth promotion; metabolites; particulates; steroids; transcriptional activation; trenbolone; wind
- ... Steroid growth promoters are commonly administered to beef cattle residing on feedyards, and a portion of these compounds are excreted in manure along with endogenous steroids. Steroids associated with aerosolized particulate matter (PM) can be transported from feedyards via wind. To assess potential androgenic and estrogenic activity of PM extracts, total suspended particulate samples were collec ...