Call Metzer and talk to them. I just found this on their site and thought you might find it useful:
Breed APA Class Foraging Ability Conservation
Status (5) Our Show Quality (6) Flying Ability Origin
Black Swedish Medium Good Watch Average None Germany
Black Runner Light Very Good Recovering Average None Indonesia
Blue Runner Light Very Good Recovering Average None Indonesia
Blue Swedish Medium Good Watch Average None Germany
Buff Medium Good Threatened Average None England
Cayuga Medium Good Threatened Excellent Color, Good Type None USA
Chocolate Runner Light Very Good Recovering Average None Indonesia
Fawn and White Runner Light Very Good Recovering Average None Indonesia
Jumbo Pekin Heavy Fair Abundant Good for Meat Classes None China
Golden 300 Hybrid Layer N/A Good No Rank Not Shown None Metzer Farms
Grimaud Hybrid Pekin Heavy Fair No Rank Meat Class Only None France
Khaki Campbell Light Very Good Watch Fairly Good Type Maybe England
Mallard Bantam Very Good Abundant Too "Chunky" Very Good Native to North America
Pekin Heavy Fair Abundant Meat Class Only None China
Rouen Heavy Good Watch Not For Exhibition Maybe France
Welsh Harlequin Light Good Critical Above Average None Wales
White Crested Medium Fair No Rank Excellent Breeders None Holland
White Layer N/A Good No Rank Not For Exhibition None Metzer Farms