Chlortetracycline and Tylosin Runoff From Soils Treated with Antimicrobial Containing Manure
his study assessed the runoff potential of tylosin and chlortetracycline (CTC) from soils treated with manure from swine fed rations containing the highest labeled rate of each chemical. Slurry manures from the swine contained either CTC at 108 μ g/g or tylosin at 0.3 μ g/g. These manures were surface applied to clay loam, silty clay loam, and silt loam soils at a rate of 0.22 Mg/ha. In one trial, tylosin was applied directly to the soilsurface to examine runoff potential of water and chemical when manure was not present. Water was applied using a sprinkler infiltrometer 24-hr after manure application with runoff collected incrementally every 5 min for about 45 min. A biofilm crust formed on all manure-treated surfaces and infiltration was impeded with > 70% of the applied water collected as runoff. The total amount of CTC collected ranged from 0.9 to 3.5% of the amount applied whereas tylosin ranged from 8.4 to 12%. These data indicate that if surface-applied manure contains antimicrobials, runoff could lead to offsite contamination.
Journal Journal of Environmental Science and Health, Part B
DOI of Published Version
Hoese, A.; Clay, S. A.; Clay, D. E.; Oswald, J.; Trooien, T.; Thaler, R.; and Carlson, C.G., "Chlortetracycline and Tylosin Runoff From Soils Treated with Antimicrobial Containing Manure" (2009). Agronomy, Horticulture and Plant Science Faculty Publications. 50.