I use a plastic three drawer unit, in which I rotate the drawers so there are just beetles in one, grown mealworms in another, and eggs and baby mealworms in the third. Each drawer has a piece of gnarled bark for the beetles to lay eggs on. The whole sits on the central heating boiler so in the dark and nicely warm.
Every month I move the beetles on to a fresh drawer and put it in the top slot; the one they came out of moves down to become the egg/baby drawer in the middle, and the one from there, now moved to the bottom, is the one I use to feed the chickens; labels record the date the beetles were moved out of that drawer. Any pupae I spot in the bottom one while collecting mealworms for a feed, I set aside in a small plastic tub, which I check daily for any hatchlings, which are then added to the beetle drawer. After a month the bottom drawer is emptied out, cleaned and refilled with fresh bran, then the beetles are moved into it, and the cycle starts again. If the clean-out harvest is greater than the chickens can eat, spare mealworms are tubbed and refrigerated until used up.
It's a really straightforward system, and has given my chickens daily fresh mealworms at minimal cost (an £8 sack of bran lasts about 6 months, and my veg peelings to provide moisture cost nothing). Plus I know what my home grown ones have eaten!
Every month I move the beetles on to a fresh drawer and put it in the top slot; the one they came out of moves down to become the egg/baby drawer in the middle, and the one from there, now moved to the bottom, is the one I use to feed the chickens; labels record the date the beetles were moved out of that drawer. Any pupae I spot in the bottom one while collecting mealworms for a feed, I set aside in a small plastic tub, which I check daily for any hatchlings, which are then added to the beetle drawer. After a month the bottom drawer is emptied out, cleaned and refilled with fresh bran, then the beetles are moved into it, and the cycle starts again. If the clean-out harvest is greater than the chickens can eat, spare mealworms are tubbed and refrigerated until used up.
It's a really straightforward system, and has given my chickens daily fresh mealworms at minimal cost (an £8 sack of bran lasts about 6 months, and my veg peelings to provide moisture cost nothing). Plus I know what my home grown ones have eaten!