I casterated two of my Tamed Reindeer, one to two rl days later they can be casterated again and give me another bollock.
I haven't tested this any further than on two of my reindeer but its seems as though these Reindeer have infinite balls.
(Makes sense as to why they refuse to do anything else but look pretty)
Thank you Jorb and Loftar for your time and for this game.
Kind Regards,
The Squishy