if I bought a roo with a sprig and its intended use was for breeding birds that adhere to the standard, and I got the birds from a repuatable breeder, I would contact that breeder and ask for a replacement bird that was of equal quality, minus the disqualifying fault, or a refund of your purchase price and shipping, health certificates, any and all expenditures associated with acquiring the defective bird. I would NOT blow it off and just breed it anyhow if I was trying to breed to the standard. If I was just looking for brown eggs and not so choosey to the standard, I would just fuggedaboudit and use the rooster until you could find a better one.