Might be worth contacting SCBA about the bull before you do the deed. There's just ben a discussion via the email system they use - folk looking for 2013 born bulls but not able to get them because they're all castrated.
Barry or Paddy will be able to tell you if your boy is genetically worth keeping entire.
My bull calf isn't because he's got Boris and Rasmie, but your's might be. If fact, if he is, I might be interested in him at weaning as I need a new bull for 2015