ality ▁rate ▁in ▁force - f ed ▁birds ▁var ies ▁from ▁ 2 % ▁to ▁ 4 %, ▁compared ▁with ▁approximately ▁ 0 . 2 % ▁in ▁age - match ed , ▁non - force - f ed ▁d rak es . ▁Mort ality ▁rates ▁do ▁not ▁differ ▁between ▁the ▁force - feed ing ▁period ▁and ▁the ▁previous ▁re aring ▁phase , ▁with ▁both ▁being ▁approximately ▁ 2 . 5 %. ▁ ▁Cont ro vers y ▁ ▁The ▁polar ising ▁and ▁controvers ial ▁nature ▁of ▁fo ie ▁gr as ▁production ▁was ▁identified ▁in ▁a ▁paper ▁that ▁ju xt ap osed ▁the ▁views ▁of ▁" fo ie ▁gr as ▁production ▁as ▁the ▁ap othe osis ▁of ▁murder ous ▁meat ▁production , ▁and ▁those ▁who ▁consider ▁it ▁to ▁be ▁a ▁co - production ▁between ▁humans ▁and ▁animals ". ▁ ▁Animal ▁rights ▁and ▁w elf are ▁advoc ates ▁such ▁as ▁P ET A , ▁V iva !, ▁and ▁the ▁Hum ane ▁Society ▁of ▁the ▁United ▁States ▁cont end ▁that ▁fo ie ▁gr as ▁production ▁methods , ▁and ▁force - feed ing ▁in ▁particular , ▁const itute ▁cruel ▁and ▁in hum ane ▁treatment ▁of ▁animals . ▁ ▁An ▁I ps os ▁M OR I ▁poll ▁found ▁that ▁ 6 3 % ▁of ▁the ▁UK ▁population ▁would ▁like ▁to ▁see ▁a ▁complete ▁ban ▁on ▁the ▁sale ▁of ▁fo ie ▁gr as ▁in ▁the ▁UK . ▁ ▁In ▁April – May ▁ 2 0 1 3 , ▁an ▁investig ator ▁from ▁Mer cy ▁for ▁Anim als ▁recorded ▁under cover