▁birds ▁per ▁m 2 , ▁and ▁out door ▁dens ities ▁of ▁up ▁to ▁ 1 7 ▁birds ▁per ▁m 2 . ▁No ▁be ak ▁trim ming ▁is ▁allowed ▁under ▁this ▁system . ▁ ▁Australian ▁Cert ified ▁Organ ic ▁standards ▁dict ate ▁a ▁maximum ▁ind oor ▁stock ing ▁density ▁of ▁up ▁to ▁ 1 2 ▁birds ▁per ▁m 2 ▁ind o ors , ▁and ▁ 2 5 0 0 ▁birds ▁per ▁hect are ▁out do ors . ▁These ▁standards ▁require ▁per ches , ▁and ▁prevent ▁large , ▁conventional ▁bro iler ▁sh eds . ▁ ▁See ▁also ▁▁▁ ▁Eth ical ▁consumer ism ▁ ▁Free ▁range ▁eggs ▁ ▁Gr ass - f ed ▁be ef ▁ ▁Organ ic ▁eggs ▁ ▁Ch ick ens ▁as ▁p ets ▁ ▁Gra zing ▁ ▁Eth ical ▁om n iv or ism ▁ ▁Y arding ▁ ▁References ▁ ▁Category : An imal ▁w elf are ▁Category : E th ical ▁consumer ism ▁Category : L iv est ock ▁Category : P oul try ▁far ming <0x0A> </s> ▁Ol ga ▁Hor ak ▁( born ▁ 1 9 2 6 ; ▁n ée ▁Rosen berger ) ▁is ▁a ▁Czech oslov ak ian - born ▁Australian ▁author ▁and ▁Hol oca ust ▁surv iv or . ▁ ▁Born ▁in ▁ 1 9 2 6 ▁in ▁Br atis lava ▁in ▁what ▁was ▁then ▁Czech oslov ak ia ▁to ▁P iro ska ▁( née ▁We iss ; ▁ 1 9 0 5 – 1 9 4 5 ) ▁and ▁Hugo ▁Rosen berger ▁( 1 8 9 4