how did you get your chickens to eat slugs? Mine won't even touch them.I even gathered up some slugs and then porch chicken scratch on it and they still wouldn't get the slugs.
My chickens liked to dig for slugs. They like digging and scratching up stuff themselves. Don't worry about it. Chickens eat what their body needs. For 3 years I had a Silkie that wouldn't eat tomatoes until our new Ameraucana went for it and now she eats tomatoes 3 years later! Chickens are wary creatures and take time to adjust to a particular meal or food. After the slugs and snails were all pretty much eradicated by the hens they suddenly decided Earwigs were a good substitute and they never touched them before! Only one of our hens chases Japanese Beetles while the others ignore them. Who knows what makes chicken food tasty - a color, a texture, a taste, a smell, a shape ???