I was reading this interesting article about how breeders can manage recessive characteristics and was just wondering if breeders actually use this method and if it is something I should ask about if a buy a pedigree puppy?  If they don't use it, should they be using it?

http://www.breedingbetterdogs.com/articles/managing_the_carriers_part_1.html

i got the book here and pedigrees papers with the different colour coded dogs on.

but not use it