This is actually a trait that most legitimate zoos will not try to breed on purpose due to white tigers being prone to genetic defects and shorter life-span.
more white tiger stuff:
The first mutant 'white' cub is believed to be the one trapped by the Maharaja of Rewa, who found it orphaned in the jungle in 1951. Named Mohan, the cub was later mated to a normal-coloured captive tigress who produced three litters with normal colouring. A few years later, Mohan mated with one of the offspring, producing the first litter of white cubs - these were to be the ancestors of others now in many zoos the world over.
The white tiger origin was recorded in India during the start of the HB Mughal period from 1556 to 1605 A.D.
The first documented case of a white tiger being captured was in 1915. He was caught by the local maharajah who kept the tiger until its death.
White tigers grow at a faster and heavier rate than orange Bengal tigers.
White tigers are extremely rare and have only been spotted in India.
During the last 100 years, only about 12 white tigers have been spotted in the wild in India; giving an approximate ratio of 1 white tiger for every 10,000 normal pigmented (orange) tigers. Their white color does not help them in their natural environment, the jungle. Rather, it is a hindrance, as the white stands out instead of blending in.