I remember seeing this in 2007 and later did a search on it only to discover the whole thing was a fake. The truth was a little depressing.
The tiger mom and the piglets were part of an entertainment feature at the Sriracha Zoo in Thailand. This zoo is noted for having a tiger breeding program in which cubs are raised to be used in circuses or for sale to other zoos. As such the cubs are probably taken from their mothers at a very young age and raised by people - or placed with a sow for equal entertainment value, at least for the hours people visit the zoo.
The zoo went so far as to dress the piglets like tigers, but apparently this was also just for show, as the tiger skins were removed after the zoo closed.
|one of the pictures from the circulated e-mail|
It is interesting to note that there are currently more tigers in captivity than in the wild, yet many of the captive tigers are inbred to the point they have health issues, and short lifespans.
Further Reading On Pet Tigers and Zoos
Facts on Pet Tigers
So... You want a Pet Tiger... Other ways of having a Pet
Issues of Zoos