I had well over a hundred chickens eat the live beetles as they flew in. It took a few minutes for some individuals to start but once they did, they consumed a lot. Neighbors with free-range birds reported similar. Difference was observed with some beetles harvested dead from traps. Some chickens did not get all that excited over those.Funny my birds wouldn't eat the Japanese beetles. They do love slugs, grasshoppers, fishing worms, and earwigs. I hate earwigs. They looks so fierce and they do bite with their pinchers. But I love my birds for eating them.
Videos of I linked show birds eating the beetles very well to point of crop fill. Taste may me impacted by type of plants the beetles consumed prior to capture. Some beetles here do eat a lot of plants with cyanide or a form of milkweed.