I was wondering about that as well, wondering if, at volume (e.g., hatchery production goals/conditions/flock management), there is a downside to have a pure NN x NN or pure NN x ? breeding plan. After all, that's what I plan to do - it gives me more control if I have at a minimum a good NN rooster (and a back up, of course), and can choose the hen to get what I want. Of course, I don't care as much about color, which could be a reason to make other decisions...
While I will admire a pretty bird as much as the next person, unless I'm breeding to SOP (which I am not likely to do), I only care about color when it affects predator resistance in birds that I might consider free ranging without overhead protection. Not there yet, but it's one reason I like my Cream Legbars - they are the same dark grey color of my dirt. Whenever I get around to getting my muscovies, which would likely range more freely by default, I will only get dark ones (likely chocolate), even though the blue and white ones are pretty to my eye. But if we had significant snow and rocks/granite, I could see those same blue and whites blending in...
- Ant Farm
I breed for color as I do everything else. I am not breeding pieces and parts of birds. I am breeding the entire in which color is a part. If I am going to do it, I want it right. I do not want junk on my yard. BUT, I get nauseated when the genetics conversations never get beyond color. It is an extreme that I detest. About as much as I dislike round fluffy birds that are good for nothing at all.