One of the podcasters was asking on the second edition of the Animal Kingdom podcast about what they feed the tigers at Animal Kingdom, but at the Toronto Zoo they feed them horsemeat as well giving them bones every other day.
Another thing mentioned in the podcast reminded me of a story I have herd the lion keepers tell about the lins getting hold of one of the wild deer in the zoo grounds. The Toronto Zoo sits in an area of Toronto known as the rogue valley. it's now a national park, anyway one night a gardner was doing some work in the lion outdoor yard (the lions were in their pens for the night). Well they were doing their work one of the wild deer from the rouge valley found it's way into the exhibit and ended up hidden by the tall grass that is in the moat between the exhibit and the guests. The next morning it made an appearance and the lions attacked it in full view of guests. There was apparently talk of trying to get the lions out of there or tranquilizing them, in the end they just let them have their feast. It took the four of them at the time about three days to finish it and they couldn't even get them to leave the exhibit to go back into their pens for the night, they also didn't eat anything else for a week after that.