Beet pulp for broodmares?

[RhndLev@cs.com]

Hello everyone, and particularly Susan:  I've just pulled my two broodmares 
off of pasture because I have fescue out there and they're due to foal in 
about 70 days.  I am running low on brome square bales because I ended up 
feeding them to my whole herd when I meant to only feed to these two mares.  
So, I plan to use beet pulp as another source of roughage for the broodmares 
while I search for another source of high quality brome that I can trust.  
How much can I feed to them without worrying about it?  Can I safely put out 
soaked beet pulp in as large a quantity as the two broodmares are willing to 
consume?  That's basically what I'm doing with my retirees who cannot eat hay 
at all, but they're used to it, and I don't want to colic the broodmares.

Rhonda