> Well, we can see how well the Japanese are doing with their "scientific research" whale killing, which is really bad as they are using it as a excuse to continue the practice.

The whales they research aren't endangered. Also, other nations and people hunt whales.

> Similar loopholes will be found here, for example: if i capture a rhino and send it to a farm for 1 week, is it now a animal that we can do "research" on? What about 1 month?

That's a possibility. But more likely, it'll create more tiger/rhino "farms". Whether that is a good thing or a bad thing is debatable just like trophy hunting.

Also, the threat to tigers and rhinos aren't poachers. It's loss of habitat due to human population growth. Where humans live in numbers, it's hard to have tigers and rhinos around because they can easily kill humans. It's why most tigers and rhinos in the world today are in zoos or wildlife enclosures.