Their development either halts or they are reabsorbed.
Two things about reabsorbtion that people usually get wrong ... if a female truly ovulates you are going to get eggs ... once ovulation occurs, there is no reabsorbtion ... and two, I've never had a female get to the point where I could feel her follicles as well defined marbles and not gotten eggs .... seems like after they get to a certain point, they'll go.
A male spurring the female may actually be of more benefit to the development of her follicles than the temp drops.
I tend to think of it like this ... drop in temps get the males in the mood and makes the females receptive to their advances .... males courting, spurring, and breeding, coupled with the temps triggers or accelerates follicular development, warm up lets the girls know that it's time to ovulate. That is a HIGHLY over simplified view of how things work, but it covers the basics.
-adam