Spyder answered quite a few of your questions, but I'll see what I can do as well.
Originally Posted by AKPaintLover
What a cute guy...how big was he... I thought that cross would generally be quite large?
Hah, well, he should have been. Dad was 17.1hh, mom was 16.1hh. He finished off at 15.2hh (and I doubt that at 4.5 years, he'd grow much more). Don't know why, as all his half siblings were well over 16.2hh. Like any breeding, its a crapshoot. Just because they "should" be tall, doesn't mean they will, much to my dissapointment.
This brings up another question...is an Oldenberg the result of crossing approved TBs and Hanovarians? OR is an Oldenberg and actual breed? What about a Hanovarian...is it an actual breed? What is the difference between Dutch, Swedish, and other warmbloods?
How do these various horses get "approved" for breeding? How are TBs approved for breeding with Hanovarians or Oldenbergs?
First of all, people all over try to make sense of the warmblood registries. Its better to accept that its just royally confusing :P
As Spyder said, they are TYPES of warmbloods, depending on where they orginitated. Trakenhers from Trakehn, Holsteiners from Holstein, Oldenburgs from Oldenburg, you get the idea ;) Stallions and mares alike can get approved with different registries depending on what criteria the registry has (its why you see TB mares that can get approved holsteiner or oldenburg or whatever, because the breed likes to allow lighter mares in to give the breed more athletic tendencies) and the resulting foals can be registered with one or several of the registries of their parents
(for example, my guy is pure Holsteiner. His dad was approved holsteiner as well as with the Oldenburg Verband. His dam was approved with the Canadian Warmblood society as well as the North American Oldenburg Society (different from the Verband :P) So, I ran into a little problem here. His sire and dam were not approved with the same registries, so I had two options. I could have him registered with with his sire's registries and accept a Certificate of Pedigree (they ask for a DNA typing to verify that the sire is actually the sire), or I could take the dam to an inspection, hopefully have her approved and then have my guy rated and approved fully into the registry. That's what I did. Took the dam to the Oldenburg Verband, had her approved, had my colt inspected, and he was fully registered. But, here's the kicker. He IS a holsteiner, but because of his approval with the Oldenburg Verband, his "breed" on his papers and his passport became listed as Oldenburg, Confused? :)
How do these various horses get "approved" for breeding?
Depends on the registry. Some registries are quite hard to get into...I find that the American/Canadian registries tend to have less regulations/qualifications then those that still remain controlled by Germany (such as the Hanoverian, Trakehner or Oldenburg verband) In North America, stallions aren't required to complete the 100 day or 30 day tests to be approved by their registry (which I think is too bad) and you see a LOT more influx of TBs then you would see in Europe.