There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
I do not have much information about this, I'm not an expert, just a fan. On the other hand, I do not think that amur tigers in Czech Republic are larger than elsewhere. For example, I saw tigers from the Nuremberg Zoo and they were comparable to the average tigers in the Czech Republic (around 210-220 kg). I saw a tiger at the Budapest Zoo and he was above average.
There is also the fact that a number of amur tigers who are in the Czech Republic have been brought to this country from elsewhere. On the other hand, a number of tigers born in the Czech Republic were exported to other countries. Of course, these processes are coordinated at international level.
For example, huge tiger Igor (240 kg at the age of 7) was brought to the Czech Republic from France. Huge tigress Altaica (115 kg at 1,5 yo) came from Sweden. Huge tiger Mauglis (246 kg at 13) came from Latvia, his partner Tsamara came from Canada, etc. Of course, in the Czech Republic there is a number of are descendants of those tigers (and others), but their origin lies abroad.
As for the Prague Zoo, they raised over 50 tigers, with their first tiger coming from Germany (during WWII). In addition, tigers from Soviet Union and other caountries came to this zoo.
Zoo Dvur Kralove produced quite a lot of tigers, rather above average, Id say. As far as I know, ancestry of those tigers lies in Soviet Union, resp. Russia...but Im not sure and Id say, that those tigers were paired with tigers who came from other countries.