[Darksheare]

I suppose simply trading breeding stock is too advanced in thought for these zoos.

[JRandomFreeper]

Like royalty in Europe, most zoo populations are pretty inter-related.

/johnny

[Blood of Tyrants]

Or simply castrating the least desirable male.

[workerbee]

There's a Q&A sidebar at the link. In discussions about the prior giraffe, I think castration was not an option because other adult males will still fight & kill it.

Prior discussions here