Antibiotics Manure source Excretion level (%) Reference
Chlortetracycline Steers faeces 75 Elmund et al., 1971[77]
Tetracycline Animal faeces 25 Feinman and Matheson, 1978[78]
Tylosin Urine 50-60 Feinman and Matheson, 1978[78]
Oxytetracycline Castrate sheep 21 Montforts et al., 1999[84]
Chlortetracycline Young bulls 17-75 Montforts et al., 1999[84]
Tylosin Pigs 40 Kolz et al., 2005[80]
Monensin Beef cattle faeces 40 Donoho et al., 1978[76]
Virginiamycin Piggeries liquid manure 20 Cocito et al., 1979[75]
Oxytetracycline Calves manure (faeces, urine and bedding) 23 Arikan, 2008[73]
Table 1: Sources and execration levels of different antibiotics.