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What Deep Litter Actually Is

Deep litter is not simply a thick layer of bedding you forget to muck out. It is a managed compost bed, and the difference between the two is the difference between a healthy barn and a sour-smelling one your birds quietly suffer in.

The principle is simple. Droppings are rich in nitrogen; bedding is rich in carbon. Get the two together at roughly three parts bedding to one part droppings by volume, keep the mixture dry enough to stay aerobic, and the naturally occurring bacteria and fungi get to work. The litter heats gently from the inside — a core temperature of 15-20°C in midwinter is perfectly normal — which dries the droppings, kills off many parasite eggs and reduces the whole lot in volume as it goes.

The result is a bed that stays friable underfoot, gives your hens something to scratch at all day, and needs a full clear-out only once or twice a year rather than every week. It also keeps birds off wet mud, which does more for foot and feather condition than most tonics you can buy.

What it is not is deep bedding — the habit of simply piling fresh shavings on top of old, wet material. That approach caps the surface, seals in moisture, and turns the lower layers anaerobic and foul.

Choosing and Building Your Bedding Base

Start with a dry, sound floor. Concrete or well-laid timber is ideal; bare earth will wick damp upward and pull the whole system down. Begin with a base layer 10-15cm deep and build gradually from there, topping up as the litter breaks down. Mature deep litter usually sits somewhere between 20cm and 30cm.

Good bedding materials include:

• Dust-extracted softwood shavings — absorbent, slow to mat, widely available.
• Chopped straw or rape straw — breaks down faster than whole straw and is easier to fork over.
• Hemp hurd or miscanthus — excellent absorption, though pricier.

Avoid hay, which carries mould spores and dust, and fine sawdust, which is a respiratory irritant. Do not use glossy paper or cardboard as a main bedding. Mixing two materials is often better than one alone: shavings for absorption, chopped straw for structure and airflow.

Turning, Topping Up and Reading the Litter

Turning is the single job that keeps deep litter working. Fork the whole bed over at least once a week in normal weather, and twice weekly during wet or humid spells when the barn holds moisture. Use a proper silage fork or manure fork and work methodically from one end, breaking up any clumps and bringing the drier material from the edges into the middle.

Judge the litter by feel and by smell:

• Crumbles in the hand — correct. Neither dusty nor claggy.
• Clumps and squelches — too wet. Fork it more often and add fresh dry bedding.
• Pricks the eyes or nose — ammonia. Act today, not at the weekend.
• Powdery and bone dry — usually a summer problem. A light misting with a watering can helps reactivate the bed.

To test for ammonia properly, crouch down to bird height and breathe through your nose. If you can smell that sharp tang from standing height, levels are already high enough to irritate respiratory tracts and cause eye problems.

Ventilation: Fresh Air Without Draughts

Ammonia builds where air does not move, and no amount of bedding will compensate for a sealed barn. You need permanent high-level ventilation that you never fully close — ridge vents, eaves gaps, or high wall louvres above head height.

The rule is straightforward: air in high, air out higher, and no draughts across the birds at perch level. Hens tolerate cold and damp far better than they tolerate stale, ammonia-laden air. On still, mild days, open doors and let the barn breathe; on cold, windy days, keep the inlets open but reduce the aperture rather than shutting everything down.

Damp is the enemy. Every litre of water spilled or exhaled ends up in the litter, and wet litter releases ammonia far faster than dry litter does. Fix leaking gutters, clear blocked downpipes, and check that rain is not driving in under doors.

Keeping the Drinkers and Feeders From Wrecking It

Nine times out of ten, the wet patch in a deep litter barn starts under a drinker. Raise drinkers on blocks or a plinth so the lip sits at chest height, use drip trays, and place them over a slatted or gravel pad if you can. Move them occasionally so no single spot gets soaked.

Feeders should be high enough that birds cannot rake litter into the trough, and never topped up with stale, damp feed. Spilled pellets ferment in the bed and draw rodents, so sweep up around the feeders every few days.

Keep litter a few inches clear of the wall base, too. That gap lets the wall breathe, makes it easy to check for red mite hiding in crevices, and lets you spot rodent runs before they become a problem.

When It Goes Wrong — and How to Put It Right

Sour litter, scaly foot problems, breast blisters and weepy eyes are all signs the bed has gone anaerobic. Do not panic and strip the whole barn. Fork the wet areas out into a barrow, add a good layer of fresh dry shavings, increase turning frequency, and sort out the ventilation and the leaking drinker that caused it.

If the whole bed has caked solid, it is quicker to remove it completely and start again than to nurse it back. Spread the spent litter on the compost heap and leave it to rot for six to twelve months before it goes anywhere near the vegetable patch — shavings-heavy litter ties up nitrogen in the soil while it breaks down. Then start fresh with a clean, dry base layer.

Do it well and the deep litter method gives you healthier birds, less bedding to buy, and a barn that smells of nothing much at all.