So a success rate of 1/100 would be hopeful. And then they'd have to get two different sexes across, so 1/200 that they get two across, and then a 1/400 that they get a male and female across.
Then you have to factor in that they'd have to have enough for genetic diversity, 100 should be enough for genetic diversity. so the loss of life would be 398*100, though the numbers should allow you to ignore sex, so 198*100 would be the total losses, or 19,800. That of course is per species. I don't think their populations were high enough.