I had heard the same thing to try getting a calf's rumen going was to bolus a portion of mama's cud down it's throat. Worth a shot, don't you think?
You could also try some really stemmy, low nutrition hay....my sheep always seem to need that to balance out the rich feed of early spring and the feed you are giving is very rich. Try offering some less yummy hay....my sheep will eat it over the good stuff in the spring time~ every time~ without fail.
Salatin states the ruminants need that balance or they cannot utilize the high sugar levels in the new grass~or corn/molasses, etc. in Dolly's case~ and can get scours.
I had intentionally bought some first cut, pale golden colored hay this year for my feeding right about now....if I still had my sheeples they would be filling up on it at this moment.