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Here are a few technical reports and research findings that may assit you.
Want more documented research ?
"The Genetic Basis of White Tigers" - Current Biology June 2013
"...we argue that the SLC45A2 A477V (white gene) substitution in the tiger morph is a viable natural pigmentation, and that the white tiger morph is a viable natural genetic polymorphism.
Despite its low frequency, this polymorphism has persisted for at least several hundred years and should be considered a part of the genetic diversity of tigers that is worth conserving."
"Genetic Diversity of White Tigers and Genetic Factors
Related to Coat Color" - Texas A&M University, Honors
and Undergraduate Research - May 2013
"....we have determined that there is not a significant difference between white tigers and
orange tigers in terms of heterozygosity"
"As a flagship species, the tiger serves as an ambassador for tigers in the wild, as well as
conservation in general. Through increased research we can gain the knowledge necessary
to protect the beloved white tiger and ensure that white tigers are carefully bred using the
management strategy that is genetically based."
"Subspecies Genetic Assignments of Worldwide Captive Tigers Increase Conservation Value of Captive Populations"
Current Biology April 2008
Well-managed captive populations of wild animals can assist in public education,
research, and fundraising (S.Christie, personal communication)and have been justified
as a ‘‘genetic reservoir'' of their natural counter parts and, thus, insurance against extinction
in the wild."
"Many Captive Tigers Are of Purebred Ancestry; Finding Raises Their Conservation Value."
Science Daily - April 2008
"...researchers discovered that many apparently "generic" tigers actually represent
purebred subspecies and harbor genomic diversity no longer found in nature."
Truth About White Tigers, All About White Tigers, White Tigers High Conservation Value
"Save the White Tiger" - Scientific American , October 2014
"The truth is that white tigers are the product of a rare but naturally occurring genetic variant within the wild Bengal population. Even so, the experts’ confusion about the subject has been understandable, given the previous lack of precise information on the white tiger’s genetic roots. It was only last year that our team published the work cracking the mystery at last."
Actual archive video from the Smithsonian Institution. President Eisenhower received the United State's first white tiger on the White House lawn, presented as a "gift to all the American people to remind us of the wonderful gifts that Mother Nature has bestowed upon us, (Dec 5, 1960).
The tigris name was "Mohini", (which means "Enchantress"). The person seen given "Mohini" a snack is Dr. Theodore Reed, Director, National Zoological Park, Smithsonian Institution, (National Zoo).
Note: The presentation was very quick so "Mohini" could get cleaned up and to her huge and brand new quarters at the zoo, where she lived an incredible long life to 21 years, (Born Oct 30, 1958, Died April 2, 1979). Tigers very rarely live past the age of 11 years in the wild. Something to be said of the care that was given to her. "Mohini" did a 3 year visit to then Chicago Zoo, 1973-1976. Some zoo's are lucky enough to have her direct decedents today.