While breeding this creature is not as difficult as others, There's an easier way to do it. When it is born I advise you feed it raw meat until it hits juvenile stage, after that point fill up troughs and the bears inventory with mixed berries, since this creature is an omnivore it can eat berries. Using berries until it is fully adult will ensure that it's food source does not spoil as quickly as raw meat can. Good Luck!
To reduce chance of killing it while trying to knock it out is by shooting with a primitive crossbow without delay until it starts to show blood then switch to a regular bow and then space shots 7 seconds apart - works every time for me no matter the level