[If] the hair of a blemished bechor fell out and he placed it in a recess in the wall, and afterward [he] slaughtered it —- Akavya ben Mahalalel permits [it], and the Sages prohibit [it]; [these are] the words of R’ Yehudah. R’ Yose [however] said: Not in this [case] did Akavya [alone] permit [it]. Rather [they argued about] the hair of a blemished bechor that fell out and was placed in a recess, and afterward [the animal] died —- in this [case], Akavya ben Mahalalel permits [it] and the Sages prohibit [it].  [If] wool is hanging from a bechor —- that which appears to be from the shearing is permissible; and that which does not appear to be from the shearing is prohibited.