“…However, most reported investigations focused more on tetracyclines, sulfonamides and fluoroquinolones in animal wastes in livestock farms due to available analytical methods, less on other classes of antibiotics such as bacitracin, leucomycin, lincomycin, florfenicol, ceftiofur and ionophores (Ben et al, 2008;Campagnolo et al, 2002;Chen et al, 2012aChen et al, , 2012bJacobsen and Halling-Sorensen, 2006;Karci and Balcioglu, 2009;Martínez-Carballo et al, 2007;Tagiri-Endo et al, 2009;Watanabe et al, 2010;Zhao et al, 2010). Therefore, it is necessary to screen various classes of antibiotics in the animal wastes of livestock farms and their receiving environments to comprehensively evaluate the risks posed by the antibiotics used in livestock farms.…”