I thought I would post an updated post on this subject. I found this on Wikipedia and it is short and to the point:
Backyard Breeding
The term backyard breeder is a general term, sometimes considered derogatory, used in USA to describe people who breed animals without selection for important genetic traits.
Usually describes those who allow animals, particularly dogs or horses, to procreate regardless of physical or genetic health as opposed to breeders who intentionally screen and select their brood for important characteristics.
If you are interested in an interesting read on breeding practices then please read over the source of
Selective Breeding.