I am unsure how they treat the animals on site, ho...

I am unsure how they treat the animals on site, however they have not guaranteed safety for their animals when "loaning" them to reality tv shows. The following is about a zebra "loaned" from Franklin Drive Thru Safari to the animal planet show 'Call of the Wildman':

"The Woozy Zebra and the Wild Mink
In another Texas-based episode, Lone Stars and Stripes, Turtleman chases a zebra that has supposedly escaped from its fenced-in yard at a ranch. He rides in hot pursuit of the animal in the flatbed of his pickup, brandishing a lasso; eventually he corners the zebra and tackles it.

But behind the scenes, things were far murkier. Production sources told me that the zebra seemed woozy during filming; it could barely walk. Animal Planet and Sharp obtained the zebra from the Franklin Drive Thru Safari, an animal park run by a businessman named Jason Clay. In a phone interview, Clay confirmed that he supplied the zebra, but denied using sedatives. Clay is licensed under the federal regulations for animal exhibitors, which specify that drugs, such as tranquilizers, shall not be used to facilitate, allow, or provide for public handling of the animals, and that handling of animals should not cause trauma, behavioral stress, physical harm, or unnecessary discomfort.

Despite Clay s denial, Animal Planet and Sharp confirmed to Mother Jones that the zebra was drugged before filming, but they say it happened behind their backs. However, Jamie and other sources say that the crew was aware of the zebra s sedation during filming, especially since the animal nearly fell over several times. I heard about the zebra being almost unusable, says another source. They sedated it, to get it to be less crazy. Another confirmed that the zebra looked out of it. Animal Planet admits that producers used an additional, unsedated zebra for supplemental footage."

Full Article "Drugs, Death, Neglect: Behind the Scenes at Animal Planet" can be found at mother jones.