Aha - just thought it might help someone who had not thought to try the Chief as a breedalbe female.
We are in a major food crisis at the moment - saved by a tidbit someone posted here - but still, it slow going to build up food.
So, we have been avoiding breeding (now at 15, youngest is at least 8).
This message makes me realize to keep in mind that our 2 original adult women are going to age out pretty soon.
ETA: OOPS!!! They already did! 51 and 53. I also have a 40 year old, so I just got her knocked up (by a 21 year old!). Otherwise, we only have girl children at this time. Looks like she is gonna be a nursing mother until she hits 50!