▁key ▁cert ifications ▁used ▁for ▁layer ▁h ens ▁in ▁Australia ▁include ▁the ▁following ... ▁ ▁E gg ▁Cor p ▁Ass ured ▁is ▁the ▁weak est ▁standard , ▁set ▁by ▁the ▁industry ▁peak ▁group ▁and ▁largely ▁based ▁on ▁the ▁Model ▁Code ▁of ▁Pract ice . ▁E gg ▁Cor p ▁Ass ured ▁diff ers ▁in ▁that ▁it ▁interpre ts ▁the ▁out door ▁stock ing ▁density ▁figure ▁as ▁largely ▁irrelevant ▁to ▁w elf are . ▁E gg ▁Cor p ▁Ass ured ▁has ▁been ▁known ▁to ▁cert ify ▁far ms ▁running ▁up ▁to ▁ 4 4 , 0 0 0 ▁birds ▁per ▁hect are ▁out do ors , ▁far ▁in ▁excess ▁of ▁recommend ations . ▁Like ▁the ▁Model ▁Code ▁of ▁practice , ▁be ak ▁trim ming ▁is ▁allowed ▁and ▁ind oor ▁dens ities ▁run ▁up ▁to ▁ 1 5 ▁birds ▁per ▁m 2 . ▁ ▁R SP CA ▁Appro ved ▁Farm ing ▁is ▁a ▁standard ▁that ▁can ▁be ▁applied ▁to ▁both ▁bar n - la id ▁and ▁free - range ▁egg ▁produ cers . ▁Far ms ▁using ▁this ▁cert ification ▁must ▁have ▁an ▁ind oor ▁density ▁of ▁ 9 ▁birds / m 2 ▁ind o ors ▁on ▁sl ats , ▁or ▁ 7 ▁birds / m 2 ▁ind o ors ▁in ▁a ▁deep - l itter ▁system . ▁The ▁standards ▁dict ate ▁a ▁maximum ▁out door ▁density ▁of ▁ 1 5 0 0 ▁per ▁ha ▁without ▁rotation , ▁or ▁ 2 5 0 0 ▁birds ▁per ▁ha ▁with ▁rotation , ▁and ▁be ak ▁trim ming ▁is ▁allowed