▁with ▁the ▁f ec es ▁of ▁cont amin ated ▁mig rat ory ▁birds . ▁Since ▁these ▁inf ected ▁wild ▁birds ▁are ▁currently ▁only ▁in ▁Asia , ▁Africa , ▁and ▁Eastern ▁Europe , ▁there ▁is ▁no ▁possible ▁chance ▁of ▁it ▁spread ing ▁to ▁ch ick ens ▁elsewhere . ▁ ▁No ise ▁In ▁some ▁areas , ▁ro ost ers ▁are ▁b anned , ▁and ▁only ▁h ens ▁are ▁allowed , ▁and ▁in ▁limited ▁numbers , ▁to ▁prevent ▁problems ▁with ▁noise . ▁H ens ▁are ▁relatively ▁quiet ▁as ▁compared ▁to ▁pet ▁dogs , ▁though ▁h ens ▁often ▁vocal ize ▁after ▁an ▁egg ▁is ▁laid ▁for ▁a ▁few ▁minutes . ▁The ▁noise ▁level ▁during ▁this ▁squ aw king ▁period ▁has ▁been ▁measured ▁at ▁around ▁ 6 3 ▁de ci b els , ▁or ▁about ▁the ▁level ▁of ▁two ▁people ▁talking . ▁Other ▁than ▁post - lay ing ▁squ aw king , ▁normal ▁hen ▁sounds ▁are ▁not ▁aud ible ▁at ▁. ▁ ▁In ▁Columbia , ▁South ▁Carolina ▁it ▁was ▁argued ▁that ▁leaf ▁blow ers ▁were ▁far ▁l ou der ▁than ▁ch ick ens , ▁that ▁dogs ▁produce ▁more ▁waste ▁than ▁ch ick ens ▁do , ▁so ▁neither ▁of ▁those ▁concerns ▁were ▁a ▁valid ▁reason ▁to ▁keep ▁a ▁ban ▁on ▁them . ▁However , ▁the ▁average ▁ch icken ▁def ec ates ▁up wards ▁of ▁sevent y ▁times ▁a ▁day , ▁compared ▁with ▁a ▁dog ' s ▁two ▁or ▁three ▁times ▁a ▁day , ▁calling ▁into ▁question ▁the ▁ver acity ▁of ▁that ▁argument . ▁In ▁ 1 9 2 6