I haven't used the Del's brand. I feed Purina Flockraiser to all my birds. The layers get half that and half whatever layer I have bought. With the Flockraiser (20 % protien) so expensive I try for cheap on the layer feed (usually 16% protien). I've used both Nutrina and Purina layers as well as Payback. Right now we're trying XCel. Some of my birds have issues and start pulling feathers out of each other to eat if they are just on the 16% protien, but others have no issues whatsoever. I offer oystershell and grit free choice.
I know the Purina feeds come in 25 pound bags as well as the 50 pound.
I know the Purina feeds come in 25 pound bags as well as the 50 pound.