Heat and Egg Drop: Keeping Layers Laying in Ghana's Hot Season

The first hot week shows up in the egg tray

At half past eleven on a March morning the house sounds wrong. The birds are quiet, many stand with their wings held a little away from their sides, and the feeder still holds more feed than it should at that hour. Two days later the egg count is down by a fifth. Farmers often blame the feed first, then the breed, then the vet, and only later look up at the roof.

In southern Ghana the hot, dry stretch before the major rains often runs from late February into April. That heat is the reason many flocks lose lay in the same weeks every year. The fix is not complicated, but it has to start before the birds show the problem.

Why heat cuts lay long before it kills

A hen is a small furnace. When the air around her is warmer than her body wants, she has to shed heat, and she does it by panting, lifting her wings away from her body and drinking more. Each of those costs energy. Panting uses up energy that would otherwise have gone into eggs, and it blows off carbon dioxide she needs to keep her blood chemistry steady.

Heat also cuts feed intake. A hen eats less when she is hot, so she takes in less energy, less protein and less calcium at the very time she is making an egg. The shell is where you see this first. Thin, rough or soft shells appear when calcium is not reaching the shell gland in enough quantity, and heat is one of the most common reasons it does not. Our egg production guide lists the other levers that protect lay.

The egg count falls because the hen is holding back. Some eggs are not laid, some are laid late in the day, and some come out small. Each of these shows up in the tray as a quieter house.

Read the birds at midday, not just at dawn

Dawn is the wrong time to judge a hot house. The birds are cool, the air is kind, and everything looks fine. Walk the house again around midday and again in the mid-afternoon, and look for the signs that heat stress is building.

• Birds with open beaks and fast breathing.
• Wings held out from the body, and birds bunching in the shade or along the edges of the house.
• Feed still sitting in the feeder at midday, when it should be going down.
• Drinkers running dry, or hens queuing at a drinker that looks slow.
• Eggs laid on the floor or in odd corners, where birds were looking for cooler spots.

Put a thermometer at bird height, not on the wall. A reading near the roof tells you little about the air the hens breathe. If you have a second thermometer, place it at the far end of the house, because the hottest spot is not always the middle.

Water first: flow, count and temperature

Water is the cheapest lever on the farm and the one most often overlooked. A layer drinks far more in very hot weather than in cool weather, and a drinker line that copes in March can run short by noon in April. Check three things every day during the hot season.

First, the flow. Run a hand along each drinker line and make sure every drinker is delivering. Air in the line, a blocked nipple or a kink in the pipe can cut the flow to the far end of the house while the front looks fine. Second, the count. There must be enough drinkers for the number of hens, and the hens at the back must be able to reach them without climbing over others. Third, the temperature. Water sitting in an open tank or a black pipe in full sun can warm enough to put birds off drinking. Shade the tanks, and cover the pipes where you can.

A simple test: on the hottest day, walk to the last drinker at midday and see whether water is coming out. If it is not, you have found part of the problem.

Shift the feeding to the cool hours

Hens eat less in the heat, and you cannot change that. You can change when they eat. Put the main feed out early in the morning, and top up again in the late afternoon as the house cools. Clear stale feed out of the feeder before it turns sour in the heat, and keep the stock in dry bags rather than a damp corner.

Calcium needs attention too. Layers that eat less may take in less calcium, so keep a separate feeder of oyster shell or a similar calcium source available at all times, and do not rely on the mash alone. Do not add a handful of anything to the feed on a whim. Talk to your feed supplier or your vet about whether the ration itself needs adjusting for the hot spell.

Do not change day length to try to fix the drop. Extra light in a hot house adds heat and does nothing for shell quality. Our lighting program notes explain why a steady day is better than a sudden change. For the full ration, see our layer feeding guide.

Housing: airflow, roofing and shade

Your house does most of the work, and it has to move air at bird height. Open sides, a good roof overhang and fans where there is power are the usual tools. Make sure curtains are fully open in the day, and that nothing blocks the air at the back of the house. A house with a closed side in the afternoon is one that will lose eggs.

Shade helps wherever sun strikes the roof and walls. Shade cloth on the sunny side, a tree line, or a well-set roof overhang all cut the heat load. Do not rely on a single fan in a long house. Fans work best when the air has somewhere to go, and in a long house the birds in the middle can stay hot even when the ends are cool. For layout ideas that handle heat well, see our poultry housing designs.

If you spray the roof to cool it, use clean water, keep the spray off the birds and stop once the house is comfortable. Wet litter in the heat brings ammonia and wet-floor problems, so keep the litter dry around the drinkers.

Shell quality in the heat: what to look for in the tray

Heat hits shells before it hits the egg count. Watch the tray for eggs with rough or chalky shells, very thin shells, or eggs that crack in the nest. Thin shells that appear in a hot spell usually recover once the house cools and calcium intake returns to normal. If shells stay poor for a week or two after the heat breaks, look at calcium, feed quality and health with your vet. Our note on soft-shelled eggs lists the common causes.

Collect eggs more often when it is hot. Three or four collections a day keep eggs out of the sun and reduce cracks and dirt. An egg left in a hot nest for hours is harder to keep clean and harder to store, so pick it up early and move it to a cool room. For storage rules, see our guide to storing table eggs.

A hot-season timetable for the house

Routine is the best defence. The timetable below is a starting point you can copy onto the wall of the house. Adjust the hours to your site and to the times your birds prefer, and keep the same routine every day so the flock record stays consistent.

Do not add or move birds in the hottest weeks

A hot spell is the wrong time to bring in new birds, sell a batch or move hens between houses. Every handling event stresses the flock, and a stressed hen in the heat drops lay faster than one that is simply hot. If you must move birds, do it early in the morning, use shaded, ventilated crates and keep the time in the crate short.

The same goes for vaccinations and treatments. Give them in the cool hours, check the birds afterwards and record the times. Your vet will tell you which programmes can wait and which cannot. Do not skip a scheduled vaccine because the weather is hot without asking first. If a molt is mixed in with the heat drop, read our molting guide to tell the two apart.

Mistakes we see most in a hot spell

1. Judging the house at dawn. The morning looks fine, and the afternoon loses the eggs.
2. Checking the roof but not the last drinker. A dry drinker line at the back is one of the most common causes of a bad afternoon.
3. Adding light to lift lay. It adds heat and does not fix the shells.
4. Leaving eggs in a hot nest. Cracks, dirt and poor storage follow.
5. Cutting feed too far. Hens need enough feed to hold their weight and their shell quality.

Checklist for the hot season

• Thermometer at bird height, read at midday and recorded.
• Drinkers counted, flow checked at the far end, and water kept shaded.
• Curtains open in the day, and fans running where the house has power.
• Shade cloth or overhang checked on the sunny side.
• Calcium available at all times in a separate feeder.
• Feed fresh, dry and out early, with an afternoon top-up.
• Eggs collected at least twice a day, with cracked or dirty eggs set aside.
• Lay rate and shell quality written in the flock record each evening.

When the heat breaks, and what to watch next

The first heavy rains bring relief, and they bring new problems. The house turns damp, the litter gets wet, and the flock can slip into coccidiosis or other wet-floor trouble. Lift the drinkers, replace wet litter and keep the house airy even though the air is cooler. Expect lay to recover over several weeks rather than a few days. Track the recovery in the egg record, and call your vet if it stays flat. Our coccidiosis notes cover the signs to look for after a wet spell.

If your flock is young enough and the house is well run, a hot spell should not change the plan. If the same losses come back every year, the fix may be the house itself, and then it is worth looking at the design before you restock. Ask us about restock timing by WhatsApp on +233 24 915 1503, or start an order through the order form once you have decided.

Questions farmers ask