Occurrence and persistence of antibiotics administered to cattle in a newly established feedlot

Trejo, Brittany; Russell, Matthew; Bartelt‐Hunt, Shannon; Beni, Nasrin Naderi; Snow, Daniel D.; Messer, Tiffany L.

doi:10.1002/jeq2.20516

Cited by 1 publication

(2 citation statements)

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“…The collection site was the third in a series of lagoons designed to collect runoff from beef cattle feedlots for use in cropland irrigation. The area of the lagoon was approximately 45,000 m 2 , with a depth ranging from 0.5 to 2 m. Wastewater from this lagoon was known to contain VAs [17,29].…”

Section: Sample Collection For Microcosmsmentioning

confidence: 99%

“…Agricultural VAs, particularly those that have been administered to animals for growth promotion or injury treatment and prevention, account for the majority of antibiotics used in many countries [13][14][15]. Consequently, confined animal feeding operations (CAFOs) have increasingly been investigated as hotspots for antibiotic accumulation and potential ecosystem impacts [16,17]. Antibiotics administered in livestock operations have been frequently detected in agricultural soils and have demonstrated the potential to affect nitrogen transformation processes by influencing the population structure of nitrogen-transforming microbial communities and, thus, the activity of N cycle processes, such as nitrification and denitrification in soils, sediments, and adjacent wetland treatment systems [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Four Veterinary Antibiotics on Constructed Treatment Wetland Nitrogen Transformation

Russell,

Messer,

Repert

et al. 2024

Toxics

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The use of wetlands as a treatment approach for nitrogen in runoff is a common practice in agroecosystems. However, nitrate is not the sole constituent present in agricultural runoff and other biologically active contaminants have the potential to affect nitrate removal efficiency. In this study, the impacts of the combined effects of four common veterinary antibiotics (chlortetracycline, sulfamethazine, lincomycin, monensin) on nitrate-N treatment efficiency in saturated sediments and wetlands were evaluated in a coupled microcosm/mesocosm scale experiment. Veterinary antibiotics were hypothesized to significantly impact nitrogen speciation (e.g., nitrate and ammonium) and nitrogen uptake and transformation processes (e.g., plant uptake and denitrification) within the wetland ecosystems. To test this hypothesis, the coupled study had three objectives: 1. assess veterinary antibiotic impact on nitrogen cycle processes in wetland sediments using microcosm incubations, 2. measure nitrate-N reduction in water of floating treatment wetland systems over time following the introduction of veterinary antibiotic residues, and 3. identify the fate of veterinary antibiotics in floating treatment wetlands using mesocosms. Microcosms containing added mixtures of the veterinary antibiotics had little to no effect at lower concentrations but stimulated denitrification potential rates at higher concentrations. Based on observed changes in the nitrogen loss in the microcosm experiments, floating treatment wetland mesocosms were enriched with 1000 μg L−1 of the antibiotic mixture. Rates of nitrate-N loss observed in mesocosms with the veterinary antibiotic enrichment were consistent with the microcosm experiments in that denitrification was not inhibited, even at the high dosage. In the mesocosm experiments, average nitrate-N removal rates were not found to be impacted by the veterinary antibiotics. Further, veterinary antibiotics were primarily found in the roots of the floating treatment wetland biomass, accumulating approximately 190 mg m−2 of the antibiotic mixture. These findings provide new insight into the impact that veterinary antibiotic mixtures may have on nutrient management strategies for large-scale agricultural operations and the potential for veterinary antibiotic removal in these wetlands.

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Section: Sample Collection For Microcosmsmentioning

confidence: 99%