Their are many different bloodlines of pits. One of the oldest are Colbys the white dog that you see is a Colby. You also have Watchdog Razors Edge Mealers Gotti Gator Breaudrex Chinaman Buthead and much more too list. If you look up Pitbull breeds you will find out a lot about their bloodlines. All bloodlines are different in their own way because breeders take the best of their dogs and breed them to be a totaly new bloodline that has the qualities that they like in their dogs. Some bloodlines have short and wide dogs that are different than the dogs that are tall and wide. The heads on a pit also are different in bloodlines too. The heads are what also makes a pit. Depends on what you like. Me I love them all.
First do you mean bloodlines or breeds that are called "pit bulls?" There are way to many bloodlines to name so If you would like to know for the American Pitbull Terrier I will gladly tell you some of them. If you would like to know the breeds that are called pitbull them go to wikipedia and type in pitbull.
Only true American Pit Bull Terriers registered in the ukc are actual pitbulls. Everything else is not a pitbull. Some people are finally admitting it and calling their dogs American bullies. But most people don't even know what a REAL Pitty looks like. Do a search on American PIt Bull Terrier. They're thin athletic tall dogs. They don't look like the pigs you see on tv and youtube..
Rednose blue nose Bourdeaux chinaman colby got ti g-boy bullies handyman purple ribbon are a few their are so many but after breeding a dog for 10 years you can make your own blood line
Go to pitbull reporter magazine they will inform you. To get the old purest pits you'll have to go with the adba not ukc, ukc allows staffs to be registered as pits, while most adba reg ones are preserved from the older bloodlines. Read about the ofrn blood lines and boudreaux lines get Richard F. Strattons pitbull books.