I usually have 2 knives on me, when hunting. One is my EDC knife that's always with me - a Buck model 285. Its nothing fancy - just a good sturdy folder that's tough enough to handle some abuse and inexpensive enough that I don't feel bad about using the hell out of it.
The other is a fixed blade that stays in my hunting pack. Right now, its an OldTimer Sharpfinger. I really like the blade design for field dressing deer. It's just an el-cheapo Chinese-made version. I wish it was an older USA-made model, but those are getting hard to come by.