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> This is a very stark oversimplification. 
Yes, I admit this.
> They had extensive agriculture, they even fed their animals with grains (preserved horse corpses like in Pazyrik are the testimony). They had gardens, they produced vegetables, fruits and wine. 
I was talking about their own diet. Of course they fed animals grains, had some bread and wine and had agriculture; this isn't to say it was either this agriculture-based civilisation or some Darwinist fantasy where they were barbarians without any civilisation at all.