I'm crossing the lines for genetic diversity, although if I wanted to I could separate out my trio of TMA lines to keep them pure. I'm only working with the TMA and GFF lines and I don't have a GFF rooster so I have to cross the TMA and GFF lines if I want any offspring from my GFF pullets.
As for my culls, any that hatch not all black are culled from the breeding flock. If I sell them as chicks I always just call them mixed breed chicks so no one gets any ideas about breeding sub par birds. If I keep them and grow them out, pullets go in my layer flock and cockerels are dinner if I can't find someone who wants them for their flock - again just calling them mixed breed birds.
Line breeding is done in most breeds and I don't see why it would be frowned upon in this breed in particular as long as you don't inbreed them for too many generations.
As for my culls, any that hatch not all black are culled from the breeding flock. If I sell them as chicks I always just call them mixed breed chicks so no one gets any ideas about breeding sub par birds. If I keep them and grow them out, pullets go in my layer flock and cockerels are dinner if I can't find someone who wants them for their flock - again just calling them mixed breed birds.
Line breeding is done in most breeds and I don't see why it would be frowned upon in this breed in particular as long as you don't inbreed them for too many generations.