Farming Housefly Maggots for Poultry Protein

Can I just put a tub of manure out and let the flies do the work?

That is the question farmers ask us most often about housefly larvae, and the answer is yes, the flies will do exactly that. The question that matters is what you want to come out of the tub, and whether you can live with the adults that come up from it. A housefly lays its eggs in wet, rotting organic matter. The maggots eat that matter, and that same matter is the rearing medium you would be using on purpose.

It is worth separating this from the soldier fly that many farmers already read about. A soldier fly larva is a different animal, reared on a different kind of feed in a different way, and it does not come with the same fly problem. A housefly is the fly already in your yard, on your feed bags and round your drinkers. Farming it means you are deliberately growing the animal that spreads disease into your flock, and the job of the unit is to keep that fly contained at every stage.

So the honest starting point is this. Housefly larvae can be a useful protein if you run a clean, closed unit and dry the output properly. If you cannot keep the adults in, do not start, because the flies you raise will reach your birds long before any protein reaches the mash.

What the maggot does between the egg and the crawl-out

Knowing the stages tells you when to act. In warm weather, eggs laid on a moist substrate hatch within about a day. The larvae then feed for roughly four to seven days, growing quickly as they eat. Once they are fully grown, they stop feeding and move away from the wet material to pupate. That moment is the harvest point, because the mature larvae leave the substrate on their own if you give them a route out.

Cool weather slows every stage, and a rainy spell can drown young larvae in standing water. Track the temperature in the unit, and write down the day each tray was started, so you know when the harvest falls. A batch that is harvested too early is mostly water. A batch left too long starts to turn into pupae and adult flies, which is the last thing you want in a feed shed.

• Day zero: lay the eggs or add the starter material on the substrate.
• Days one to four: larvae feed and grow, and the substrate must stay moist but not wet.
• Days four to seven: growth peaks, and the larvae start to leave the wet material.
• Harvest: collect the crawl-out larvae before pupation begins.

Building a closed unit that keeps the adults in

The unit is the most important part of the project, and it is where most farmers go wrong. Build it as a small, lidded box or shed with fine insect mesh over every opening, a door that closes behind you, and a floor that can be washed. Mesh should be fine enough that an adult fly cannot squeeze through, and the mesh should be inspected each week for holes from rats, lizards and wear.

Site it away from the chick house, the brooder, the feed store and the place you keep eggs. Put it downwind of the poultry houses if you can, and do not put it beside a drinker or a path the birds use. Flies follow odours, so a unit that smells of rotting material draws flies from the whole yard, and the neighbours will notice before your birds do.

Keep the unit in order with a fixed routine. Close the door after every visit, wash your boots at the entrance, and keep a fly swatter or a sticky trap inside the unit so you can count what gets in. A rising count of adult flies inside a unit that should be closed is the first sign that a mesh or a door has failed.

Choosing a substrate that is clean enough to use

The substrate is what the maggots eat, and it is the input you can least afford to get wrong. Clean cattle manure that has been aged for a few weeks is a common starting point, because it is moist, mostly free of live weed seed and not in the same stream as your birds' droppings. Mix it with a little bran so that the maggots have a feed that holds moisture well. The mix should feel like a squeezed sponge, damp to the touch but not dripping.

The table below sets out the common options and where each one stands.

Do not use manure from your own layer or broiler houses as the base. Poultry manure carries the worm eggs and the bacteria you are trying to keep away from the flock, and it may carry medicine residues if your birds have been treated. Ask yourself where the substrate came from before you add it. If you cannot name the source and the treatment history, do not put it in the tray.

Never use dead birds, carcasses, offal from slaughter, or spoiled feed. A decaying carcass is exactly where the bacteria that cause botulism grow, and the maggots that feed on it can carry the toxin inside their bodies. The next bird to eat them can be paralysed within a short time. Our botulism guide explains the signs, and that is why we treat this rule as one with no exceptions.

Harvesting: the crawl-out tray and the bucket

The cleanest way to harvest housefly larvae is to let them leave the substrate by themselves. Use a shallow tray with a slope on one side, fill it with dry bran or dry sawdust, and set it so that the lower edge runs into a collection bucket with a lid. Mature larvae crawl away from the moist material, drop over the edge and fall into the bucket. You are left with clean, sorted larvae and a much smaller job of sieving.

Do not dump the whole tray into a bucket by hand. That method mixes live larvae with substrate, flies and debris, and it breaks the rule that the unit stays closed. Use a fine sieve to remove any remaining substrate, then rinse the larvae in clean water and drain them before drying. Any larvae that look dead or discoloured go into the bin for the substrate, not the feed.

Harvest on the same day each batch, and write the quantity on the bucket lid. A simple tally tells you whether the substrate is working, because a batch that falls well below its usual count points to a moisture or temperature problem.

Drying every batch before a single maggot reaches the mash

Fresh housefly larvae are mostly water and spoil quickly in the Ghana heat. They also carry the bacteria from their substrate, so drying is both a storage step and a safety step. Spread the harvested larvae thinly on clean mesh raised off the ground, cover them with fine netting to keep flies off, and dry them in the sun or in a shaded, ventilated shed. A dryer or a low-temperature oven works if you have one. The aim is larvae that crumble when pressed, not a pile that still feels soft in the middle.

Turn the batch often, and do not let it sit in the rain or in the damp of the night. Dried larvae can go mouldy in a humid store, so put them in a sealed container with a desiccant pack or a bag of dry rice, away from the feed bags. Label each container with the date and the batch number. Use the oldest batch first and throw out anything that smells sour or shows mould.

Grinding comes after drying, not before. A ground meal absorbs moisture quickly and goes off faster than whole dried larvae. Grind only what you will use within a few weeks, and keep the grinder clean so that the meal does not pick up grit or old residue.

What the protein numbers mean, and why to ask for a lab result

Dried housefly larvae are often reported to carry more than half their dry weight as protein, and they also carry a fair amount of fat. Those are useful figures, but they are not a guarantee for your batch. The protein moves with the substrate, the age of the larvae at harvest and how well the batch was dried. Calcium is low compared with fishmeal, so a maggot meal does not fix a shell problem on its own.

Ask for a lab analysis of your own dried batch if you plan to sell or feed it routinely. Ask for crude protein, fat, moisture and ash at minimum, and for the microbial count if the lab offers it. A batch that tests well on protein but badly on bacteria is not a feed you should give to your birds. Keep the results with the batch record so that you can connect any problem in the flock to the batch that caused it.

When you compare maggot meal with soya meal or fishmeal from your feed merchant, compare the protein and the cost per kilo of protein, not the cost per kilo of meal. A cheap meal that is weak in protein can cost more per unit of protein than a dear one that is strong.

Inclusion: start small and read the birds

Start at two to three per cent of the mash for adult layers and grower birds, and stay at that level for at least two weeks. Watch feed intake, the consistency of the droppings, the feather cover and the weight of a sample each week. If the birds eat less, grow slower or show loose droppings, drop the share and check the batch before you raise it again.

Do not put housefly maggot meal into the feed of day-old chicks or birds in the first weeks of brooding. Those birds have small digestive systems and very little immunity to bacteria in feed, and the risk is not worth the small saving. Wait until the birds are older and stronger, then introduce the meal in the same slow way.

Change one thing at a time. If you add maggot meal in the same week you change the water supplier or the feed mill, you will not know which change caused a problem. Write the date of the first inclusion in the flock notebook and leave the rest of the ration alone for two weeks.

A worked example for a 300-bird layer house

Take a 300-bird layer house eating about 110 grams of mash each a day. That is 33 kg of mash daily. At two per cent maggot meal, the house needs 660 grams of dried meal a day, which is roughly 20 kg a month. That sounds small until you ask how many trays it takes to make 20 kg of dried larvae, how much substrate each tray uses, and whether you can produce that quantity every day without gaps.

The answer in most small units is that the meal is a supplement, not a replacement for the feed bill. A unit that can supply part of the protein and does it safely is worth having. A unit that stops every second week because the substrate has run out is a source of flies and worry, not protein. Plan the volume first, then decide whether the unit is worth building.

Write the numbers down before you start: daily feed, the share of meal, the monthly need in kilos, the trays needed and the days each tray takes. The sums will tell you quickly whether the project is a feed plan or a hobby with a smell.

Mistakes that turn a maggot unit into a health problem

The problems we hear about nearly always trace back to a short list of mistakes.

• Opening the unit to check the tray and leaving the door ajar while the birds are scratching nearby.
• Using poultry manure from the house as the substrate because it is free and close.
• Feeding fresh, undried larvae to the flock, then finding loose droppings and a sour smell in the feed store.
• Letting the substrate dry out in the harmattan, so the larvae stop growing and the unit goes quiet and then smells.
• Letting standing water collect in the tray during the rains and drowning a whole batch.
• Starting a unit next to the chick house or the brooder because the space was handy.

Each of these is cheap to avoid and expensive to fix once the flies are in the house. A closed unit with a written routine is the cure.

Keeping the unit away from the chicks and the feed

A housefly unit is a biosecurity risk whether it is working well or badly. Keep it apart from the chick house and the brooder, and do not let the same person walk from the unit to the chicks without changing footwear and washing hands. Our biosecurity guide sets out a simple routine for footbaths, visitors and gates, and that routine applies to this unit too.

Keep dried meal in a separate store from the feed bags, and label it clearly so that nobody mixes it into the wrong mash. Fly control in the rest of the yard matters as well. Our fly control guide explains how to keep the flies on your poultry farm down, and a maggot unit must not become the largest fly source you have.

Finally, keep records of the flock health alongside the maggot batches. If a bird falls ill, you need to check which batch was in the mash that week, and you cannot do that from memory.

Checklist before you open the first tray

Work through this list before you add any substrate. A missing item is a reason to wait, not a reason to start and fix it later.

1. Confirm the rules on rearing and waste with your district assembly and the Environmental Protection Agency.
2. Build a lidded, fine-meshed unit, sited away from the chick house, brooder and feed store.
3. Source a clean, aged substrate, and write down where it came from.
4. Set up a crawl-out tray and a sealed collection bucket, and check the mesh each week.
5. Plan a drying area that is covered, clean and raised off the ground.
6. Decide the inclusion level, write it in the flock notebook, and keep the chicks and brooder off the meal.
7. Ask for a lab analysis of your first dried batch before you rely on it.

Where Halaal Farms fits alongside a feed project

Halaal Farms is a day-old chicks hatchery in Opeikuma, Kasoa, and we do not sell maggots, larvae or feed ingredients. A maggot unit is a feed project, and it sits on top of the chicks you buy. While you set up your feed bins and your unit, we can stock your chicken side, so the birds are in the house when the meal is ready.

Our broiler day-old chicks and layer day-old chicks come in ventilated boxes of 50, and you can start from our order form. For current starting prices, see our prices page, and check our FAQ for what happens on arrival. WhatsApp us on +233 24 915 1503 to talk through the chicks and the timing.

Questions farmers ask