Transport of oxytetracycline, chlortetracycline, and ivermectin in surface runoff from irrigated pasture

Abstract

The transport of oxytetracycline, chlortetracycline, and ivermectin from manure was assessed via surface runoff on irrigated pasture. Surface runoff plots in the Sierra Foothills of Northern California were used to evaluate the effects of irrigation water application rates, pharmaceutical application conditions, vegetative cover, and vegetative filter strip length on the pharmaceutical discharge in surface runoff. Experiments were designed to permit the maximum potential transport of pharmaceuticals to surface runoff water, which included pre-irrigation to saturate soil, trimming grass where manure was applied, and laying a continuous manure strip perpendicular to the flow of water. However, due to high sorption of the pharmaceuticals to manure and soil, less than 0.1% of applied pharmaceuticals were detected in runoff water. Results demonstrated an increase of pharmaceutical transport in surface runoff with increased pharmaceutical concentration in manure, the concentration of pharmaceuticals in runoff water remained constant with increased irrigation flow rate, and no appreciable decrease in pharmaceutical runoff was produced with the vegetative filter strip length increased from 30.5 to 91.5 cm. Most of the applied pharmaceuticals were retained in the manure or within the upper 5 cm of soil directly beneath the manure application sites. As this study evaluated conditions for high transport potential, the data suggest that the risk for significant chlortetracycline, oxytetracycline, and ivermectin transport to surface water from cattle manure on irrigated pasture is low.

Fate and transport of antibiotics and antibiotic resistance genes in runoff and soil as affected by the timing of swine manure slurry application

“…2016; Bair et al, 2017;Li et al, 2016;Popova et al, 2013). LCM is highly soluble and has been detected in leachate (Domínguez et al, 2014), surface water , and snowmelt runoff from manure-amended soil.…”

Measuring the occurrence of antibiotics in surface water adjacent to cattle grazing areas using passive samplers

“…In the literature, there are only a few studies investigating the fate and transport of veterinary antibiotics from cattle grazing areas to surface runoff. For instance, in a study conducted by Bair et al (2017), the occurrence of chlortetracyline and oxytetracycline in surface waters affected by irrigated pasture was investigated. They reported that the concentration ranges of chlortetracycline and oxytetracycline were 0.001-0.7 and 0.001-1.3 μg/L, respectively.…”

Transport of Veterinary Antibiotics in Farmland Soil: Effects of Dissolved Organic Matter

“…As such, a full understanding of VA transport and fate in soil is of high relevancy with respect to their environmental risk in manured farmland. Dominant paths of VA transport in farmland soil are runoff and leaching, both of which are dependent on VA sorption to soil, soil hydraulic properties, and precipitation characteristics [14][15][16][17]. It is worth noting that the sorption of VAs to the soil matrix can not only reduce their mobility and availability, but also protect antibiotics from degradation [18].…”