Couple of things.
First, you can't breed Kasyrra yet.
Second, it takes about 10 motherwort infused grottato to max out ferocity and virility (If you have the breeder perk)
Third, If you want to get your virility higher, lady evergreen can take you up to 50.
Fourth, If you want to go even higher, then Lumia can take you up to 100 and this is as high as it can go.