Analysis: The photos are genuine, but there's more to this story than meets the eye.
To begin with, the snapshots were taken at the Sriracha Tiger Zoo in Chonburi, Thailand (near Bangkok), not some nameless zoo in California. Moreover, it would appear that the sad tale of the tigress falling into a deep depression after losing a litter of cubs was fabricated, as was the claim that zookeepers substituted the piglets for deceased tiger cubs in order to console the "mourning mother."
As it happens, this sort of intermingling of species is not at all unusual at the Sriracha Tiger Zoo, where "creating successful relationships with animals of different species" is something of a guiding principle.
The facility, more accurately described as part zoo and part circus, boasts offbeat attractions like basketball-playing elephants, "lady crocodile wrestlers," and a petting zoo where customers can bottle-feed baby tigers with their own bare hands. Visitors have reported seeing tigers, pigs, and dogs all housed together within the same enclosure, with sows nursing tiger cubs and tigresses nursing piglets "adorned in tiger-print costumes."
The costumes are strictly for show, by the way. The mother tiger pictured above, who has been photographed on other occasions suckling piglets au naturel, was herself nursed by a pig in infancy and apparently regards the other species as family, not prey.