sorry I have to type in English right now. I was trying to type it all in chinese in school, but the simplify input drives me nuts....
Here is the reason
go check out 猫咪论坛 There is a article in there talks about what should be in your cat's dry food and what shouldn't. They analyze it pretty well, but the things is that it was some old data. For example, the ingredients they have in there for the Kirkland dry cat food is totally different! (I think they change the ingredients long time ago)
To choose the best dry food for your cat, you have to be the one that compare the ingredients.
If you are on PTT, go to cat board and search for a article from feelicia there are lots of evidence there!
expensive food doesn't mean it is good, cheap food doesn't mean it is bad either.