There's been an interesting conversation going on at the FHL on spaying,
timing of spaying, removing jills from estrus, etc. at:
 
http://www.smartgroups.com/message/viewdiscussion.cfm?gid=1423922
&messageid=5690
 
and
 
http://www.smartgroups.com/message/viewdiscussion.cfm?gid=1423922
&messageid=5784
 
Including:
 
http://www.smartgroups.com/message/readmessage.cfm?gid=1423922
&messageid=5801&startid=5802
 
Just some more info on taking a jill out of heat.  Lupron can be used to
take a jill out of heat.  When she is more stable, and her PCV is close
to normal then she can be spayed safely.
 
Hope that helps,
Jerry Murray, DVM
[Posted in FML issue 4242]