I'd love to start having more conversations about the narrative and outcomes for breeding. It seems to me that little incentive exists to devour bats, given the Family boost is greater than the vampiress boost and doesn't cost .1 (or whatever the value of a bat is). It also seems that the Vampiress is definitely underweight in all the currently defined plans for her utilty.
I propose that the event of breeding will not only create the new collection item, but also have an effect on the vampiress called "Blood Lust". Each time a vampires is bread she gains +2 to daily blood produciton. If she devours a bat prior to breading, she gains +3 post ritual. Of course, any of the details could be tweeked as the lair determines. This vote simply dictates that breeding should boost the Vampiress in some way.