Hi,
Absolutely you need to buy from a top breeder who has worked with this color for generations. In chickens, there are a lot of sex linked genes. This makes it cost $$$ and
lots of time to grade up . In mammals not a lot of sex-linked genes and much easier to grade up stock.
This is a new Orpington color in America. Take a real good look at the color. Sit back and watch the conversations online and who seems to be the leading breeders. Watch which lines they used and how they combined them. Is there a common thread there? A couple of fountainhead strains which nick real well? Keep that in mind as you select your strains. You should have one strain and one related strain as a back-up should disaster befall your flock. Watch what the veteran breeders in this color do.
Do not cross strains to found your flock. That can be problematic, esp. with Blue involved. Find a quality breeder who will be there for you after the sale. Willing to help you understand how to breed this color and help you cull for quality until you get it down. Expect to pay $$ for these quality birds. Maybe even 50. each for started birds. Do not start with eggs or chicks You need started birds so the breeder has culled them at least once for quality and it's apparent these birds will be representative of the breeder's efforts. I paid 150. for my foundation trio ( 1M,2F). And have never regretted it.
Best Success,
Karen