The hunting season last 12/4=<<12/4=3>>3 months
So he goes hunting 3*6=<<3*6=18>>18 times a year
That means he gets 18*2=<<18*2=36>>36 deers per year
So he catches 36*600=<<36*600=21600>>21,600 pounds of deer a year
That means he keeps 21600/2=<<21600/2=10800>>10,800 pounds of deer a year
#### 10800