Storing Animal Feed Through the Rains: Damp, Moulds, Rodents and a Weekly Check

The bag of layers mash looked fine when it came off the matatu. Three weeks later, at the bottom of the stack against the back wall, it has gone hard in one corner, smells faintly of a damp cupboard, and there are small dark droppings along the seam. The hens are still eating, but less. The farmer tips the bad corner out, feeds the rest, and wonders why egg numbers are slipping.

Bought feed is usually the biggest cash cost on a dairy or poultry farm, and in the wet season the store is where a share of that money quietly disappears. Damp turns meal into a home for moulds. Rats and mice eat it, foul it and tear the bags. Weevils and flour beetles move into anything kept too long. Most of the loss is invisible until it shows up in the animals: lower intake, lower milk or eggs, and, in the worst case, toxins you cannot see at all.

This guide covers the store itself: where feed should sit, how to keep damp out, what moulds and aflatoxin mean for your animals in plain terms, how to keep rodents and insects off the bags, how much to buy at a time, and a weekly check that takes ten minutes. It applies to dairy meal, layers and broiler feeds, and rations you mix yourself.

Why Feed Spoils Faster in the Rains

Animal feed is dry food, and like any dry food it takes up water from the air around it. Ground feed is worse than whole grain because grinding exposes far more surface for moisture and moulds to reach. In a dry month the meal stays dry. In the rains, the air in a closed store is damp for days on end, the floor is cold and wet, walls wick water, and roofs leak in places nobody noticed in August.

Moulds need three things: moisture, warmth and food. The feed is the food and the store is often warm enough, so moisture is the factor you can actually control. A bag that sits on a concrete floor draws water up from below; a bag against a wall draws it in from the side; the bags in the middle of a tight stack cannot breathe, so any moisture that gets in stays there. That is why spoilage almost always starts at the bottom, the back and the middle, exactly where you do not look.

Our guide to post-harvest grain storage covers whole grain in sacks and hermetic bags. Feed is different in one important way: it is usually bought or mixed already ground, so it has less time in hand before it starts to deteriorate. Grain can be stored for a season; meal should be used in weeks.

Moulds and Aflatoxin, Explained Plainly

Moulds are fungi. On feed they show as grey, green, white or black growth, caking, clumping, warm patches and a musty smell. Animals notice spoiled feed before people do and eat less of it, so the first cost of mould is lower intake, and lower intake means less milk, fewer eggs or slower growth.

Some moulds also produce toxins called mycotoxins. The one that matters most in Kenya is aflatoxin, produced mainly by the mould Aspergillus flavus in warm, humid conditions. Aflatoxin can harm the liver and the immune system of livestock and poultry, and young birds and animals are especially sensitive. In dairy cows, aflatoxin in the feed can pass into the milk in a modified form, which is why it is a food safety issue for your family and your milk buyers, not only an animal health one.

Three points about aflatoxin are worth holding on to. First, you cannot see, smell or taste it, and heating, pelleting or cooking does not reliably destroy it. Second, feed can carry aflatoxin without any visible mould, because the toxin may have formed in the grain before it was milled. Third, visible mould does not prove aflatoxin is present, but it does prove the feed has been damp enough for moulds to grow, which is reason enough not to feed it.

If you mix your own rations, inspect every ingredient on arrival and reject anything damp, discoloured, musty or caked. Our guide to mixing your own dairy meal covers ingredient sourcing in more detail. For bought feed, buy from suppliers who turn stock over quickly, check the manufacture date on the bag, and refuse bags that are torn, stained or damp to the touch.

Setting Up the Store: Off the Floor, Off the Walls

The ideal feed store is a dedicated room with a sound roof, a dry floor, walls without cracks, a door that closes tightly at the bottom, and vents high on the walls covered with fine wire mesh. Many farms do not have that, and a corner of a house or a shed can work if the same principles are followed.

• Pallets under every bag. Raise feed on wooden pallets, timber poles or blocks so that air moves underneath and floor moisture cannot wick up. Even a hand's height off the floor makes a large difference, and it also lets you see droppings or water under the stack.
• A gap from every wall. Leave enough space between the stacks and the walls to walk along, or at least to put an arm in and check. Walls are cold, often damp, and are the routes rats use.
• Stacks you can inspect. Keep stacks small and separate, with an aisle down the middle, instead of one solid block in a corner. Feed that cannot be seen cannot be checked.
• Fix the roof first. After the first heavy rain, stand in the store and look up. Any drip line over feed is a bag lost. Move the stack until the leak is fixed.
• Keep out fertiliser, chemicals and fuel. Feed stored next to agrochemicals, rodent bait, paraffin or fertiliser can be contaminated, and a spilled container can ruin a whole stack.

A cheap thermo-hygrometer on the store wall shows temperature and relative humidity. Read it at the same time each day. A humidity reading that stays high day after day tells you the room is damp, not just the weather, and that you need better ventilation or a drier place for the feed. As a rule of thumb, readings that sit above about 70 percent for long periods are a warning sign for meal. Open the vents and door on dry, breezy days and close them at night and during rain, when the outside air is wetter than the air inside.

Bins and Opened Bags

An opened bag is the weak point of any store. It takes in moist air every time it is opened, rats can reach it easily, and it is often left on the floor beside the animals. Once a bag is opened, tip what you will use in the next few days into a container with a tight lid: a plastic bin, a clean drum or a lidded bucket. Keep the container off the floor, use a dry scoop that lives in the container, and never scoop with wet hands or a wet tin.

Do not top up a half-full bin with new feed. Old meal at the bottom stays there, gets older, and seeds the fresh feed with insects and mould. Empty the bin completely, brush it out, let it dry, then refill it. The same rule applies to feeders in the poultry house and troughs in the cow shed: feed left to cake in a corner spoils the fresh feed poured on top. Our guide to reducing poultry feed wastage covers feeder hygiene and setup.

Rodents and Weevils: Keep Them Out, Then Watch for Them

Rats and mice do far more damage than the feed they eat. They tear bags, which lets in damp and insects, and they contaminate feed with urine and droppings, which can carry diseases that affect animals and people. A store that rats can enter freely will lose feed every night of the season.

Exclusion comes first. Seal gaps under the door with a strip of metal or a board, block holes where pipes and cables enter, cover vents with fine wire mesh, and repair cracks in walls and floor. Sweep up spilled feed every day, because spills feed the rodent population that then goes for the bags. Pallets and a clear gap from the walls take away the hidden runs rats prefer. If you use traps or bait, keep bait inside a tamper-resistant bait station well away from feed, out of reach of children, pets and livestock, and follow the label.

Insects are the other pest. Weevils, flour beetles and moths breed in feed that is kept too long, especially in warm stores, and their presence shows up as webbing, clumps, fine dust at the seams and small moving insects when you open a bag. Insects also raise the temperature and moisture of the feed around them, which helps moulds. The best control is time: buy smaller quantities more often, clean out old residues before new stock arrives, and keep the store and the bins swept clean.

First In, First Out, and How Much to Buy

First in, first out simply means the oldest feed is used before the newest. It sounds obvious, but in most stores new bags are stacked in front of old ones because that is where there is space, and the old bags at the back are found weeks later. Write the date of delivery on every bag with a marker, stack new bags behind or on top of old ones as your layout allows, and always take from the oldest stack.

The other half of the rule is buying for the time feed actually keeps. Bulk buying looks cheaper, but feed that spoils is the most expensive feed there is. Work out how long a bag lasts on your farm, and buy for a few weeks rather than a whole season. The chart below works through four farms using stated assumptions.

The sum is the useful part. A farm with one cow using a bag every two to three weeks has every reason to keep only one or two bags in hand in the rains. A farm with 200 layers gets through a bag in about three days and can safely hold more bags, because each one is used before it has time to deteriorate. Weighing what you actually put in the feeder for a week, on a simple platform or hanging scale, gives you your own daily figure and often shows waste nobody had noticed.

Home-mixed rations need extra care. Ground maize, bran and oilseed cakes go stale and rancid faster once mixed, and anything with molasses or wet ingredients attracts moulds and insects quickly. As a rule of thumb, mix only as much as you will use in a short period, often a week or two, and store the batch exactly like bought feed. Our guide to feed mixers and ration mixing explains batch size and cleanout.

A Ten-Minute Weekly Check

A store that is checked every week rarely loses more than a bag before the problem is found. Put the check on the same day each week, ideally after a rainy spell, and write the results in a notebook kept in the store.

1. Look at the building. Check the roof for new drips, the floor for wet patches, and the walls for damp marks, especially after heavy rain.
2. Read the hygrometer and write the figure down, so you can see whether the store is getting damper week by week.
3. Feel and smell. Push a hand into the middle of the bottom bags and the bags against the back. Warmth, caking, hard lumps or a musty smell mean the bag has taken in moisture.
4. Check for pests. Look for droppings, gnawed seams, torn corners, webbing and fine dust at the seams, and check traps and bait stations.
5. Rotate and record. Bring the oldest bags forward, note how many bags are in stock, and decide when to reorder.

When a bag fails the check, take it out of the store at once. Do not feed visibly mouldy, caked or musty feed to any animal, and do not dilute it into good feed. Note the batch and the supplier, and if several bags from one delivery are affected, tell the supplier. If animals have already eaten suspect feed and show reduced appetite or illness, call your vet.

Store Basics, With Prices

A dry store needs very little equipment, and most of it is cheap compared with a single spoiled bag. These are current prices from the Fuga price list; confirm stock with the team before you travel.

Damp, rodents and time are the three enemies of stored feed, and the rains bring all three together. Raise the bags, clear the walls, seal the gaps, buy for weeks rather than months, and walk the store once a week with your hand and your nose. For a thermo-hygrometer, storage bags, scales or feeders that keep feed clean in the house, talk to any Fuga branch or WhatsApp 0716 961 018. For the cows themselves, our guide to keeping dairy cows productive through the rains covers the rest of the season.

Frequently Asked Questions