Polyclonal Ab purification - (Jul/15/2013 )

I need to purify polyclonal Abs from an animal bleed. What is the appropriate Ammonium sulfate concentration to ppt out the Abs before I proceed to affinity purification?

I found these at protocol-online.org main page

http://www.protocol-online.org/cgi-bin/prot/view_cache.cgi?ID=2340

http://www.protocol-online.org/cgi-bin/prot/view_cache.cgi?ID=652