I never had any trouble getting any of mine to eat the sulfa, but they always looked like they had been snorting a boat-load of coke when they got done. ;o)
You can't add ANYTHING to Jakes feed without him turning his nose up at it, which kinda surprises me since he is such a food fanatic. You shoulda seen mine after the Co-Op spread the lime in the pasture. Talk about snorting coke! I should have taken some pictures cause it was like that for several days since we did not get any rain.