You could try to find out what happens to the meat after the experiment is finished--is there a butcher that buys it to resell for consumption? Here at Davis, we have a meat lab
, which recycles the meat from animals used in science (as well as trains students in food processing). Knowing that would make me feel better, since it implies no net increase in animal slaughter.
As a corollary, if your school has something similar or partners with a local butcher in a similar capacity, definitely hit that place up if you eat meat (or cheese, or eggs). Local, small-batch meat processing is infinitely better than the industrial-scale slaughterhouses that provide the meats in your local supermarket, both in animal cruelty as well as in taste.