Sometimes my get a little mold and I just toss it whole biscuit in the run. I trust a chicken would know what mold to eat and what mold not to eat. Although we raise them they still have a natural instinct.
The ducks will take it down to the roots and the chickens take it from there. It's a win for all parties involved. If you want you can pull it early before the roots get to thick and the ducks can handle it all.
Barley is boss. I spout ALOT of it. I also sell tons of seed for those who are interested. My flock eats it up! Here a little clip of one of the biscuits.