White Leghorns

[Mitsos Lamprogiorgos]

I think your thinking is right but I don't think you need to make it so complicated. For one a commercial leghorn (Hen) should be around 4 lbs. This makes them a smaller bird which automatically means it should consume less feed. So if it lays consistently almost all year then your egg to feed ratio will be good.

As far as the outcome is less predictable if you were to get offspring that produced less or grew to large (ate more food laid less) these birds could be culled out of your breeding project. You could then breed for your own specific traits and choose the roosters and hens accordingly until your happy with your outcome. You are always going to get some birds with the positive sides and some with the negative.

It is just like the Cornish crosses. All the different lines and breeding that go into making that one egg that produces the incredibly fast growing bird is unrealistic IMO for most home breeding projects to duplicate.

Sorry, but the hybrid white meat chickens consist of many many breeds (white cornish, white plymouth rock, white jersey giant, white orpington and maybe many others). The same with the white broad breasted turkey.
The commercial leghorn is bred from 4 lines of old utility old italian leghorns.
A, B, C and D are the grandparents.
Not inbred of course.
AB dad is used over CD mothers.
Again not inbred.
We are all buying the ABCD children.
There aren't other breeds contained.
There is the California white hybrid, but it consumes more food I think, it is rare and lays smaller eggs. And I don't know if it is pearl white. I never had.