I also "harvest" Japanese Beetles. This year, I'm freezing some for winter treats. If I'm digging in the garden, I have a container nearby to collect any grubs I dig up. Free chicken food, pest management. Win-win.
The chickens all know what it means when I say, "Bug snack!"
This time of year, I catch all the Japanese Beetles I can. One of my hens in particular loves them, and the chicks found out how good they are yesterday.
I am on a mission to eradicate the :ducthings! Yeah, I know I won't succeed, but I can try!