▁have ▁found ▁evidence ▁of ▁infl amm ation ▁of ▁the ▁walls ▁of ▁the ▁pro vent ric ulus ▁after ▁the ▁first ▁session ▁of ▁force - feed ing . ▁There ▁is ▁also ▁indic ation ▁of ▁infl amm ation ▁of ▁the ▁es oph ag us ▁in ▁the ▁later ▁stages ▁of ▁f atten ing . ▁Several ▁studies ▁have ▁also ▁demonstrated ▁that ▁mort ality ▁rates ▁can ▁be ▁significantly ▁elev ated ▁during ▁the ▁g av age ▁period . ▁ ▁The ▁feed , ▁usually ▁corn ▁bo iled ▁with ▁fat ▁( to ▁facil itate ▁ing estion ), ▁depos its ▁large ▁amounts ▁of ▁fat ▁in ▁the ▁li ver , ▁thereby ▁producing ▁the ▁but tery ▁consist ency ▁sought ▁by ▁some ▁g astr onom es . ▁ ▁D uck s ▁re ared ▁for ▁fo ie ▁gr as ▁are ▁typically ▁sla ugh tered ▁at ▁ 1 0 0 ▁days ▁of ▁age ▁and ▁ge ese ▁at ▁ 1 1 2 ▁days . ▁At ▁this ▁time , ▁the ▁bird ' s ▁li ver ▁is ▁ 6 ▁to ▁ 1 0 ▁times ▁its ▁ordinary ▁size . ▁Storage ▁of ▁fat ▁in ▁the ▁li ver ▁produces ▁ste atos is ▁of ▁the ▁li ver ▁cells . ▁ ▁Altern ative ▁production ▁F atten ed ▁li ver ▁can ▁be ▁produced ▁by ▁alternative ▁methods ▁without ▁g av age , ▁and ▁this ▁is ▁often ▁referred ▁to ▁either ▁as ▁" f at ty ▁go ose ▁li ver " ▁or ▁as ▁fo ie ▁gr as ▁( out side ▁France ), ▁though ▁it ▁does ▁not ▁conform ▁to ▁the ▁French ▁legal ▁definition . ▁This ▁method ▁involves ▁timing ▁the ▁sla ugh