IMO nurturing is certainly a huge factor. No doubt. But how would you explain for example Furioso. Heavily used in German warmblood breeds. Known for completely unexplained blow-ups and no way of correcting it. Only waiting until he was back to normal helped. And to this day only one line back to him is enough to produce this trait.
Or Gharib, SE. His offspring is known for being difficult. Super performance horses but not for the normal rider/owner. Recent example Hadidi.
A mare I had, Gharib granddaughter through Nijamin. Difficult personality, super sensitive, stubborn as a donkey sometimes. Her son, the same. His daughter, out of an irrational, completely unrelated russian-Crabbet mare, inherited all traits from her sire and granddam, not a single one from her dam.
I was told by several breeders to stay away from Ruminaja Ali. Nuttcase, in their words. That I cannot tell, never met one of them.
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