If cattle and horses couldn't live in Prax, then the nomads wouldn't have to worry about them. There would be no need to fight and kill those people who keep them. That would be dull. You could assume that simple religious prejudice is enough to keep the nomads fighting the cattle/horse people. I prefer to give them a good underlying reason for their religious prejudice.
If cattle and horses can survive but only marginally, then the nomads have some need to go after them, but they can afford to take the long view since the horse/cattle folk can't really compete with the well-adapted nomads. This could work out well for your game, but I want this conflict to be a bit hotter in mine.
If cattle and horses can survive and actually thrive in Prax, then the cattle/horse peoples are real competitors for the nomads and the nomads need to attack these people to preserve their own land and way of life.
Here's a possible idea to really drive the conflict: Cattle and horses not only survive in Prax, but as they interact with the environment (or as their owners perform their various annual rituals on the land) the land becomes modified to improve their survival and becomes less well-adapted for the native animals. This gives the nomads a whole lot of reasons to ensure that cattle- and horse-grazing never get established in Prax.
Another possibility is that horses and cattle may sometimes harbour endemic diseases or parasites that aren't much of a burden for them, but are serious problems for the native beasts. This gives a good underlying reason for the nomads' taboos against horses. Contact with a horse might allow the infection to get back to a nomad's own herds, even a dead horse is unclean. Of course, this infection problem could work both ways, leading both sides to despise the other.
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