Sterile vs highly sterile suggestion

[insane]

I just have a quick suggestion re: sterile and highly sterile. As I understand it, sterile horses can never have children while highly sterile horses have a 50/50 shot. I feel like this can be a bit confusing, so my suggestion would be to change highly sterile to something like infertile to hopefully better capture the difference between the two. Obviously not a huge deal either way but I just wanted to throw it out there

[ratty]

i feel like infertility might create the same issue as highly sterile. Maybe "Low Fertility" would be better.