More seriously, given the hopes for cubs, I wonder if the agreement allows for a swap of males in these circumstances?
I imagine the 'emasculation' of YangYang means that if they do resume breeding attempts, it will only be by AI, or there would need to be a swap of males to allow further attempts at natural mating. My fear would be the female has remained non-pregnant so long now that breeding might be compromised even more, as she isn't a young animal any more. Apparently the same thing happened with the male GaoGao in San Diego though it was only one testicle removed and he had been a successful breeder several times over. He has now been returned to China, leaving the old female and one of their sons(aged 6) but not sure why he has been reclaimed at this stage.