Oh, just wait until you include avians. There are so many chickens. Soooo many.
While it is crazy, all of the animals listed are already some of the largest physical beings on the planet. Multiply them to 10000x the size of other animal populations, and this is what the scale will turn to.
It shows the ability of humans to preserve and propagate animal species when there is an incentive to do so. No need to worry about cows going extinct.
Depends on how you define extinct; for example: how many bovine are there in the wild? Are domestic bovine genetically equivalent to prior wild bovine populations? Etc.