for slaves too :> I think it should give same exp as for killing them ^^
If I remember correctly at some point herding brahmin did hail about 75 EXP, but I could be wrong about this.If you don't want people to herd and kill, though, I would suggest tamed brahmin give no EXP for kills.Edit: Also, I'm not sure if this is already available to you, but there's a butcher in modoc, anyone who has the guts can get their cow butchered in exchange for some money.
I totally agree with this idea... in present time, you can hunt for slaves, but whats the profit? Slaves are poor in fights and for one slave you can earn just about 200 caps if you sell one... not really profitable business, and some xp for enslaving will give some boost to this profession...