Supplementary File 1) Ranges used for making categorical variables,,
,Range,Category
DOF,0-3,DOF 1
,Apr-70,DOF 2
,71-120,DOF 3
,121-180,DOF 4
,>180,DOF 5
Total ADD - individual samples,< 10,Low exposure
,19-Oct,Medium exposure
,>19,High exposure
Total ADD - pen-floor samples,< 400,Low exposure
,400-1100,Medium exposure
,>1100,High exposure
Parenteral tetracyline exposure - individual animals,0,No exposure
,>0,Any exposure
Parenteral tetracyline exposure - pen-floor samples,0,No exposure
,>0,Any exposure
Parenteral macrolide exposure - pen-floor animals,0,No exposure
,>0,Any exposure
Parenteral macrolide exposure - pen-floor samples,0,No exposure
,>0,Any exposure