Watching... I have the issue both ways.... Sheep and lambs will do anything to get to the chicken food and the chickens watch me like hawks for sheep feeding time! Even buying the bigger ewe rolls doesn't put them off! I feed the chickens grain, but remeber reading recently that layers have 4 % calcium... What are ewe nuts (cause the lambs will nibble that). Don't KNOW, but my gut would be not to worry as a a one off....