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I meant "a number of animal species" when I wrote all kind. You are right, other animals are excluded, the pig isn't one tho. Great many steppe people herded pigs (they even had poultry for that matter) - the huge amount of pig bones among the archaeological findings proves that - and this has cultural impact too, for example a 10th Pecheneg chief was called Tonuzoba (domuz + aba).
It is very simplistic view to think steppe people were horse herders who roamed the steppes constantly. Or maybe I should call it false. They even had constant settlements with artisans.