English: “Its crop with its feathers” — its crop is the zefek; might one cut it out with a knife? The verse says “with its feathers” — he removes the feathers with it.
In the sugya: The phrase “be-notzatah” blocks the possibility of carving the crop out alone with a knife. The feathers (or down) attached to the crop must come away with it; the removal is of the crop-and-plumage unit.
Type of Learning
Diyuk of “be-notzatah” — crop removed with its plumage.
What Is Learned
The crop is removed together with the plumage attached to it, not carved out alone with a knife. The verse’s “with its feathers” is the source for treating the crop and its attached feathers as a single unit of removal.