I suspect the strain of capture and movement from so far away would make it unlikely that even a formerly healthy moose would grow or keep proper antlers. I also suspect that a realistic movie about the activities of animal capture units for Colosseum shows would be picketed by animal rights activists even if it were a cartoon. We have shows like Spartacus that are very violent but we see men cutting men in the arena but not critters.
Doug ... here is your trivia fun-fact for the day ... http://www.all-about-moose.com/moose-antlers.html Pretty amazing, eh? ... those moose-dudes lose their horns each year!! (and then it's back to the gym each year to make sure they can grow their horns back and get some tail) Ahaha, hey imagine a world where the older you are => the bigger your antlers grow, eh? Yah, it stated that the old bullmoose with the big rack merely had to show-up and then the younger moose would run away ... sadly, in the human-world, when the old dudes show-up, then the hot chicks usually run away and look around for the young studs!! (where's the justice, eh?)