▁the ▁milk ▁they ▁drink ▁has ▁come ▁from ▁c ows ▁with ▁the ▁freedom ▁to ▁ro am ▁and ▁can ▁gra ze ▁in ▁their ▁natural ▁habitat . ▁ ▁Australia ▁ ▁Australian ▁standards ▁in ▁relation ▁to ▁free - range ▁production ▁are ▁largely ▁esp oused ▁in ▁third - party ▁cert ification ▁trade ▁marks ▁due ▁to ▁the ▁absence ▁of ▁any ▁significant ▁leg ally ▁binding ▁legisl ation . ▁A ▁number ▁of ▁cert ification ▁bodies ▁are ▁util ised ▁by ▁rear ers ▁to ▁identify ▁their ▁products ▁with ▁a ▁particular ▁level ▁of ▁animal ▁w elf are ▁standards . ▁In ▁events ▁where ▁produ cers ▁do ▁not ▁choose ▁to ▁use ▁a ▁cert ified ▁trade ▁mark ▁and ▁merely ▁state ▁that ▁their ▁product ▁is ▁' free ▁range ', ▁the ▁producer ▁is ▁bound ▁by ▁consumer ▁expect ations ▁and ▁per ception s ▁of ▁what ▁constit utes ▁free ▁range . ▁Produ cers ▁are ▁generally ▁thought ▁to ▁be ▁bound ▁to ▁Model ▁C odes ▁of ▁Pract ice ▁of ▁Animal ▁W elf are ▁published ▁by ▁the ▁C SI RO , ▁and ▁in ▁some ▁states ▁this ▁forms ▁part ▁of ▁legisl ation . ▁ ▁E gg ▁lay ing ▁h ens ▁ ▁In ▁Australia , ▁three ▁far ming ▁methods ▁for ▁the ▁production ▁of ▁eggs ▁are ▁util ised . ▁In ▁ 2 0 1 1 , ▁traditional ▁c age ▁( or ▁battery ) ▁eggs ▁account ed ▁for ▁ 4 2 % ▁of ▁value , ▁bar n - la id ▁eggs ▁account ▁for ▁ 1 0 % ▁of ▁value , ▁free - range ▁eggs ▁account ed ▁for ▁ 4 4 % ▁of ▁value , ▁and ▁organ ic ▁eggs