retained sperm
I have to disagree with the previous post. as most chams can retain sperm, it is accepted among most that jacksons do not retain sperm. i've been breeding them for a while now, and none have ever given birth without actual copulation. i may be wrong, but every book and article i've read seem to be in agreeance. hope this helps. ps: definitely give her time between litters. Let her skip cycles. you'll know by her coloring.