Hi Gerry,
Hopefully, you'll find somebody on this website who can supply the snakes that you need, but most people either have their snakes in hibernation/brumation right now (preparing for breeding) or are just starting to bring them out. Maybe you'll be able to buy a gravid female. This would be a much more relaible way to get a bunch of related young, and you would be able to control their diet from "day one."
Remember that in order to have meaningful scientific results, you need replicates... the more the better. You'll need multiple controls on one diet and multiple "treated" snakes on another diet. If you want to do the music experiment, you'll also need multiple controls and multiple "treated" snakes. The best experiments are simple, yet reliable (i.e. few variables examined, yet large enough sample sizes to be meaningful.)
If you can't find what you're looking for here, you might try some of the other snake sites with classified add sections. We posted a thread with several listed here (
Post Breeders), but this is the slow time of year everywhere. This might be a good time to tell a breeder what you're looking for, though.
Also, divide your experimental groups up randomly. Don't put all of the large snakes, females, most active snakes, etc. into the same group, or it'll bias your results. You might consider giving one group a fish-only diet and another group a diet of only pinkie mice/parts and seeing which group grows faster (if either)
. There's a bit of scientific literature already available to reference. Hope you get a lot of good feedback, and best of luck to you and your daughter,
Rick