It is not a good group anymore, ever since the arrival of Ya Kwanza. Only one female breeds out of four, and with no babies or juveniles coming up through the group- just the five adults.
I do not know if YK is still fertile after his operation- perhaps that is why there is no recent breeding with Hallili?
I believe there may be plans to reorganise the group(apart from moving Sakina) and this is long overdue-though its not the first time I've heard it has been talked about. Ya Kwanza is the main problem- they need a different male.
They have always seemed very reluctant to move Ya Kwanza, despite his shortcomings, which I think they acknowledge but not to the extent of doing something about him-so far at least.
If they do replace him I think it definately needs to be with another fully adult male and preferably one that is already a proven breeder/group leader. I am sure the existing long-established females would reject or dominate either a young or an inexperienced male so there might still not be any mating.
The problem with the Howletts/PL bachelor males is they have been away from females a long time- a shortcoming demonstrated when Oumbi transferred to Twycross. But in principal a change as you outline would be worth trying, to improve the breeding prospects at Jersey.
