Drug Withdrawall Times

["Snodgrass, Bonnie" <snodgrab@ncr.disa.mil>]

     I feed my horse a supplement with yucca in it and occasionally use 
     bute or MSM to manage arthritis. I need to know suggested withdrawal 
     times for these items. I know yucca was just discussed but didn't see 
     anything about when to stop feeding. Can anyone help with info about 
     any or all of these items????
     
     Bonnie Snodgrass