▁growth - prom ot ional ▁agents ▁since ▁ 2 0 0 3 . ▁Moreover , ▁several ▁organizations ▁( including ▁the ▁World ▁Health ▁Organ ization , ▁the ▁National ▁Academy ▁of ▁Sciences , ▁and ▁the ▁U . S . ▁Food ▁and ▁D rug ▁Administration ) ▁have ▁advoc ated ▁restrict ing ▁the ▁amount ▁of ▁ant ib i otic ▁use ▁in ▁food ▁animal ▁production . ▁However , ▁commonly ▁there ▁are ▁del ays ▁in ▁regul atory ▁and ▁legisl ative ▁actions ▁to ▁limit ▁the ▁use ▁of ▁ant ib iot ics , ▁att rib utable ▁partly ▁to ▁resistance ▁against ▁such ▁reg ulation ▁by ▁indust ries ▁using ▁or ▁s elling ▁ant ib iot ics , ▁and ▁to ▁the ▁time ▁required ▁for ▁research ▁to ▁test ▁caus al ▁links ▁between ▁their ▁use ▁and ▁resistance ▁to ▁them . ▁Two ▁federal ▁b ills ▁( S . 7 4 2 ▁and ▁H . R . ▁ 2 5 6 2 ) ▁aim ed ▁at ▁ph asing ▁out ▁non ther ape ut ic ▁use ▁of ▁ant ib iot ics ▁in ▁US ▁food ▁animals ▁were ▁proposed , ▁but ▁have ▁not ▁passed . ▁These ▁b ills ▁were ▁end ors ed ▁by ▁public ▁health ▁and ▁medical ▁organizations , ▁including ▁the ▁American ▁Hol istic ▁N urs es ' ▁Association , ▁the ▁American ▁Medical ▁Association , ▁and ▁the ▁American ▁Public ▁Health ▁Association . ▁ ▁Despite ▁p led ges ▁by ▁food ▁companies ▁and ▁restaur ants ▁to ▁reduce ▁or ▁eliminate ▁meat ▁that ▁comes ▁from ▁animals ▁treated ▁with ▁ant ib iot ics , ▁the ▁purchase ▁of ▁ant ib iot ics ▁for ▁use ▁on ▁farm ▁animals