7-5. 平飼的雞隻因有足夠空間可扒地，所以腳趾甲較不會過長。而籠飼管理的雞隻則只能抓扒一些周邊的設施，如保護雞蛋的條板或餵料區的設備。 In non-caged systems nails stay short as the hens scratch through the litter and scrabble across the concrete floor. In cages, chickens can only keep their nails short by providing special facilities like abrasive strips on the egg protection panel which the hens scrabble across while feeding.