"in your cattle and in your sheep": From "You shall not work with the bechor of your bullock, and you shall not shear the bechor or your flock," we learn that it is forbidden to shear and to work with a bechor. This tells me only of a bechor. Whence do I derive (the same for) other offerings? It follows a fortiori, viz.: If a bechor, which does not obtain with all births, and which becomes chullin (non-consecrated) without redemption, may not be shorn or worked with, then all other offerings, which do obtain with all births, and which do not become chullin without redemption — how much more so should it be forbidden to shear them or to work with them!— No, (this can be refuted, viz.:) this may be true of a bechor, whose holiness is from the womb, and whose holiness is upon it (even) if it is permanently blemished.
Would you say the same for other offerings, where the above do not obtain? It must, therefore, be written "in your cattle and in your sheep you shall consecrate" (i.e., you shall not shear or work with other offerings).