Short answer: Soya is the most dependable protein in most Ghanaian rations, but only once heat has knocked out the anti-nutrients in the raw bean. Groundnut cake is cheap protein with a serious toxin risk, because aflatoxin hides inside the cake where you cannot see it. Heat-treat or toast your soya, test every lot of groundnut cake before it goes in the mix, and never try to fix a bad lot by blending it into good feed.
Key takeaways
- A raw soya bean is not feed. Heat it properly, or buy meal that the processor has heat-treated.
- Toasting is a skill: golden and nutty is right, dark and smoky means over-cooked.
- Aflatoxin in groundnut cake hides inside the cake, so a clean look tells you nothing.
- Blending a bad lot into good feed spreads the toxin around. It does not remove it.
- Keep groundnut cake away from young birds, and feed it only from a lot that has a test result.
A soya bean is built to resist being eaten
A raw soya bean is a seed, and seeds carry defences against the animals that would eat them. The main one in soya is a family of compounds called trypsin inhibitors. They block the enzyme that digests protein in the gut, so a bird fed raw beans cannot make full use of the protein in them, and it grows slowly. Over time the pancreas can swell as it works harder to make up for the loss.
Heat destroys most of these compounds. That is why every commercial soya meal goes through a heat step, and why the question with home-made or cheap soya is always whether it was heated properly. Raw beans are not a shortcut. They are a feed the bird cannot use well.
Soya comes in four forms, and they are not interchangeable
Farmers use the word soya for four quite different products. Know which one is in the sack before you do the sum.
| Form | Typical protein | Oil | Ready to feed? | What to check |
|---|---|---|---|---|
| Raw whole beans | Around 35 to 40 per cent | High | No, it needs heat first | Never feed raw. Ask how it was treated |
| Home-toasted beans | Similar to raw, but heat has changed it | High | Yes, if toasted properly | Light golden colour, nutty smell, split skins |
| Full-fat extruded or expelled soya | Varies with the process | High | Yes, if the processor heated it well | The heat treatment and the protein figure, in writing |
| Solvent-extracted soya meal | Around 44 to 48 per cent | Low | Yes, standard in most mixes | Protein, moisture and colour on the sheet |
The cheapest soya per bag is not always the cheapest per kilo of protein. A whole bean carries oil, so it brings energy as well as protein, and that changes the sum. Work out the ration with the form you actually have, not the one on the price list.
Toasting soya at home without burning it
Some farmers toast their own beans to save money, and it can work. The trouble is that it is easy to get wrong in both directions. Under-toasted beans leave the trypsin inhibitors in place. Over-toasted beans lose some of their lysine, which the bird needs more than almost any other amino acid, and you cannot see that loss in the pan.
- Pick out stones, soil, mouldy beans and split seeds before you start.
- Heat a wide, heavy pan over a moderate flame and spread the beans in a single layer, not a deep heap.
- Stir constantly. A few beans scorching on the bottom will spoil the batch if you walk away.
- Stop when the beans are light golden, the raw beany smell has gone and a good number of skins have split.
- Spread them on a clean tray and let them cool completely before grinding. Hot beans clump in the mill.
- Grind to a coarse meal, mix it within a few days, or store it sealed and dry.
Dark brown beans with a smoky smell are over-cooked, and lighter is always the safer side to err on. If you need proof that the heat worked, ask a laboratory for a urease test on a sample. It is the reliable check, and it is cheap next to a month of stunted birds.
What soya gives the bird, and what it does not
Soya is valued for its lysine. Most grain-based rations, maize especially, run short of lysine, and soya fills that gap well. It is less generous with methionine, the other sulphur-containing amino acid birds need. That is why a maize and soya mix usually needs a methionine source added to be complete, and why a formulator looks at the whole mix rather than the protein figure on one bag. Our piece on maize in poultry feed shows what the grain side of that mix brings.
A bag labelled with a protein percentage does not tell you how much of that protein a chick can use. The amino acid profile and the bird's ability to digest it matter as much as the percentage. A good sheet lists lysine and methionine, and a good seller can show you those figures for the lot in front of you.
If you are comparing soya with fishmeal as a protein, the amino acid question is the one to ask first. Our guide to reading a fishmeal sheet takes the same approach from the other side.
Groundnut cake: cheap protein with a toxin problem
Groundnut cake is what is left when groundnuts are pressed for their oil. It is a good protein, often in the low to mid forties per cent, and in many markets it is cheap, which is exactly why it gets bought in a hurry. The trouble starts before the nut reaches the press.
The mould that makes aflatoxin, Aspergillus flavus, grows on groundnuts in the field, especially after a dry spell, and it keeps growing in nuts that go into storage damp or unsorted. Drying and pressing do not remove the toxin. A cake made from a mouldy lot is a mouldy cake, and the damage is done before the bag is sealed.
Why a clean-looking cake can still be dangerous
We want to be blunt about this. A cake that looks clean, smells of nuts and shows no visible mould can still carry aflatoxin. The toxin can sit inside the kernel and inside the cake, where your eyes and nose cannot reach it. Visible mould is a warning, and a musty smell is a bigger one, but the absence of both proves nothing.
Young birds are the most sensitive. Chicks and growers fed aflatoxin can grow poorly, respond weakly to vaccines and suffer more from other infections, and the damage can be hard to see until the flock has been eating it for a while. Older birds are not safe either, and layers add a second concern, because a flock that is unwell does not lay well.
How to sample a load before it goes in the mix
A lab result is only as good as the sample behind it. The most common mistake is to test one bag from the top of the stack, which is usually the cleanest bag in the load. Mould tends to sit in pockets, so the sample has to come from across the whole load.
- Do not sample only the top layer. Open bags spread across the load, including the ones at the bottom and the ones near the wall.
- From each bag, take a handful from more than one depth, and mix them together in one clean bucket.
- From the mixed material, take a sealed, labelled sample of about a kilogram. Write the seller, the date and the lot number on it.
- Hold the rest of the lot in a dry place, and do not feed from it until the result is back.
- Send the sample to a laboratory that tests for aflatoxin, and keep the receipt with the sample number.
Test the first lot from any new seller, then test again whenever the source, the season or the look and smell of the cake changes. One clean result from the dry months does not cover a load bought in the middle of the rains.
Blending a bad lot does not make it safe
Some farmers think that mixing a small share of a doubtful lot into a large batch of good feed will dilute it into safety. It will not. The toxin is spread through the mix, and every bird that eats the mix still takes its share. A lot that tests high comes out of the feed, full stop, and that includes the bags you were planning to use as a small amount.
The same goes for heat. Ordinary home cooking does not reliably destroy aflatoxin, so do not roast a suspect cake and hope for the best.
Need chicks for your next batch?
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Storing soya and groundnut cake without spoiling them
Groundnut cake has oil, and oil goes rancid. Soya meal is less oily, but it takes up moisture and mould quickly. Both want a dry store, raised off the floor, out of direct sun and well clear of the walls. The harmattan air is dry and helps. The rains are the danger.
Think about buying in the dry months and holding a modest stock. A big load bought just before the rains often sits through the wettest weeks of the year in a store that was never sealed. Check each bag when you open it. A sweet, nutty smell is normal. A sour, musty or damp smell is not, and neither are clumps or damp patches that feel warm. Our article on wheat and rice bran makes the same point about bulky ingredients, which take up moisture just as readily.
When a lot fails the test
- Stop feeding from that lot the same day, and label every bag as held.
- Do not sell, swap or give it to another farmer or to animals.
- Ask the seller for a replacement lot and the test result in writing.
- Dispose of the cake where dogs, goats and children cannot reach it.
- Watch the birds for a few days, and tell your vet about any drop in intake, weight or egg output.
Starting chicks on a sound protein plan
Most of the risks above fall hardest on the youngest birds, which is why the start of the feed plan matters so much. Our chicks leave the hatchery vaccinated and with a batch record, but the feed they eat in the first weeks is your decision, and it sets the growth curve that follows. Our chick starter feed guide covers the amounts and the phase change in detail.
If you are planning a broiler or a layer house, start with our broiler day-old chicks or layer day-old chicks pages. Place an order through the order form when you are ready, and bring any question about the feed plan for your strain to WhatsApp, +233 24 915 1503.
Questions farmers ask
Is raw soya safe to put in the trough?
No. Raw soya beans contain compounds that block protein digestion, and birds fed raw beans grow slowly and can develop an enlarged pancreas. Heat treatment removes most of the problem. Whole beans must be toasted properly, or you should buy soya meal that the processor has heat-treated. Raw beans are a poor feed, even when they look cheap.
How can I tell if my soya has been heat-treated?
You cannot be sure by looking. Ask the seller how the meal was processed, and check the colour and smell. Heat-treated soya is a golden to tan colour with a neutral smell. A urease test on a laboratory sample is the reliable check, and it is worth doing with any new supplier.
Is groundnut cake safe for layers?
It can be, but only with a clean test result for that lot and only in a small share. Groundnut cake that shows mould or a musty smell should not go near the layers. Keep a record of every lot you test and what it showed, so you know which sellers you can rely on.
Can I tell aflatoxin by looking at groundnut cake?
No. Aflatoxin can be present without visible mould or a bad smell. Visible mould and a musty smell are reasons to stop, but a clean-looking cake still needs a laboratory test before you feed it, particularly to chicks and growers.
Will roasting groundnut cake remove the toxin?
Do not rely on it. Aflatoxin is heat-stable, and the temperatures you reach in a kitchen pan or a home oven will not reliably destroy it. Roasting may change the smell, but it does not make a contaminated cake safe to feed.
Is home-toasted soya as good as bought soya meal?
They are different products. Toasted whole beans keep their oil, so they bring more energy and less protein per kilo than solvent-extracted meal. Work out the ration with the protein and oil figures of what you actually have. If you switch from one to the other, change slowly and watch intake and weights.
My birds grew slowly after I changed to a new soya. What went wrong?
Check three things first: whether the soya was properly heated, whether the lysine and methionine balance has shifted, and whether the lot carries mould or aflatoxin. Test the lot if you can, and read the sheet again. If the birds stay off feed or look unwell, call your vet before you change anything else. You can find more answers on our <a href="/faq/">FAQ page</a>.
