Should've really stated that they only give birth every 3-4 years, females won't enter heat until their Cubs have matured and left her.

As for purchasing them as pets I can't condone it all, just keeping them in captivity requires a dedicated team that can supply the animal with specialised care, and in most cases the Tigers cannot be kept past the age of 4-5 years old, I'm also completely against Human-Tiger contact as seen in some of the "Sanctuaries" throughout Thailand.