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I am sure that it is a genetic condition but it is not that easy that it only depends on the father. Chang is a good example: his father Chieng Mai has HUGE tusks (nearly as long as Radza`s), while Chang is tuskless, but one of Chang`s sons in Bellewaerde/Belgium is a tusker. The former breeding bull from Emmen, Naing Thein, is tuskless, and most of his sons have only small "tushes". But one of his sons, Aung Bo, has real tusks, although I guess they will always stay relatively short. So the genes of the mother and the grandparents must play a role too.
There are not many bulls in Europe who are older then 30, but many who are only around 10-15 years, and some of them already have very impressive sets of tusks and will likely become big tuskers like Radza in the next decades. For example Sammy/Amersfoort and Victor/ Zoo Berlin. The new bull in Rotterdam, Timber, is only 9 and already has an impressive set of tusks, so I think he is a good condidate too.
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