Sorry I don’t have any advice on how to get them to eat them.
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I came here thinking "I have the same question." I like your answer. My girls were looking at me like I was insane today when I called them for treats and offered them a couple of earthworms.Some earth worms taste worse than butt. I would focus on insects first. There is a bit of a learning curve eating critters and it is generally easier to start with those that taste good.
It is experience that I have seen. We have been rearing about 30 Speckled Sussex exclusively on feed. They will not consume even live meal worms. I am certain they can learn the merits of eating them with a little more exposure. The pattern likely holds for most chickens fed only feed.These won't touch worms, snails,slugs anything mucous producing "can't blame them lol."
Yours probably have a reason, chickens don't tend to be picky unless they have a very good reason.
Consumption of such fare by free-ranging chickens may have to do much with other options available. It appears that worms are not the most preferred prey. If the chickens with experience are given a choice, then they consume other protein rich items first. Worms are like a second choice option.I've seen some weird patterns in my flock around earthworm consumption. They went after them like candy up until the spring of 2017, when they quit cold-turkey. Wouldn't even peck at them. They only started consuming them again this year. It's not that I got new birds, either. The same ducks/chickens that had been warring over them seemed to unanimously reject them. Basically, if they don't want them, you ain't changing their mind. "You can give a duck a worm, but you can't make him like it."