I think someone is having you on or doesn't know what they have. There is no such breed.
In England, there were some birds being sold as "Polish Diving Pigeons". In truth, they were Doneks with grouse legs and small muffs. They may have also been crossed with Kelebeks.
Doneks are originally...
Well, your only pictured Old German Owl is the shield marked bird in Photo #7. Photos #2, #3, #5 and #10 are Chinese Owls. The bird on the right in Photo #2 shows evidence of crossbreeding between a Chinese Owl and another breed (shows a zipper type frill) - the bird on left is a Chinese Owl...
You can generally get wheat from any feed stores.
The egg pellets are fine for your breeders (but they will want more water).
They are totally unsuitable for tumblers or rollers that you intend to fly, even just rom the standpoint of protein and water intake.
Most chicken scratch has cracked corn.
Some successful old timers used to feed it (the late Stanley Plona comes to mind), but if the cracked corn gets damp and mildews, it will result in lip cankers. While canker is not very dangerous to the adult birds, they will pass it to their young, who...
Most of your training and flying problems will come down to the amount of feed that you are giving them. Heavy regulation of the amount of feed will not only get rid of their laziness, but also make them responsive to commands to get back into the loft.
Keep your flying birds separate from...