Egg Binding and Prolapse in Layers: Causes, First Aid and Prevention for Ghana Farms

The call usually comes in the early evening. A layer farmer at Gomoa or Ashaiman has walked the cages at feeding time and found a hen sitting flat on the wire, tail pumping, eyes half closed, straining like she is trying to push out something that will not come. Sometimes the farmer has already lost one the day before and found her with the vent pecked bloody by neighbours. The question is always the same: is this a disease, and will it spread?

It is not a disease in the infectious sense, and it will not spread the way Newcastle spreads. But egg binding and vent prolapse are rarely one-off accidents either. When we go through the history with the farmer, we almost always find a management cause: pullets brought into lay too early or too fat, a layer mash short of calcium, lights turned up too fast, birds that had not been dewormed, or a heat wave that stopped the birds eating. Fix the individual hen if you can, but fix the cause or you will be back on the phone next week.

How a hen lays an egg, and where it goes wrong

A laying hen ovulates a yolk roughly every 24 to 26 hours. The yolk travels down the oviduct, picking up albumen, the shell membranes and finally, over about 20 hours in the shell gland (uterus), the calcium carbonate shell. The finished egg is then pushed into the cloaca and out through the vent by strong muscular contractions. During the final push, the lower oviduct actually turns partly inside out for a moment so the egg is delivered clean, then it snaps back inside. In a healthy hen of the right body weight this happens in seconds.

Egg binding is what happens when an egg gets stuck somewhere in the last stretch of that journey, usually in the shell gland or the cloaca. The hen strains, the muscles tire, and because the egg presses on the nerves and blood vessels of the pelvis and on the intestine, she quickly becomes unable to pass droppings, then goes into shock. An egg bound hen that is not helped will typically die within 24 to 48 hours.

Prolapse is what happens when that inside-out moment does not reverse. Part of the oviduct or cloaca stays outside the vent as a pink or red mass. Sometimes the egg is still inside it. Other hens see the red tissue, peck at it, and the bird can be eviscerated within an hour in a crowded cage or pen. Prolapse can follow egg binding, because the straining pushes the tissue out, but it also happens in hens laying normally if the tissue is weak or the egg is unusually large.

Recognising an egg bound hen

Straining is the classic sign but not the only one, and not every straining hen is egg bound. Here is what we look for when a farmer brings a bird in:

• Posture. The hen stands or sits in a penguin-like upright position, tail down, or she sits flat with the tail pumping up and down rhythmically.
• Behaviour. She has left the flock, is off feed, walks with a waddle or a wide stance, and may go in and out of the nest repeatedly without laying.
• Abdomen. Feel gently below the vent with fingertips. A hard, egg-shaped object low in the abdomen just above the vent is usually the stuck egg. Compare with a normal hen if you are unsure.
• Droppings. Few or none, because the egg blocks the intestine. If she does pass anything it is often just white urates.
• Vent. May be swollen or reddened. Look for a shell edge visible inside the vent if you part the feathers in good light.
• Time course. Egg binding comes on over hours. A hen that has been off colour for a week with a swollen abdomen is more likely to have egg peritonitis, ascites or a tumour, which need a vet, not egg-binding first aid.

Safe first aid for egg binding

The aim of first aid is to relax the hen, lubricate the passage and give the muscles the calcium they need to contract properly. Do this calmly and quickly; do not spend the whole afternoon on it.

1. Move her somewhere warm, dark and quiet. Stress tightens muscles. A cardboard box with a towel in a warm room is ideal. Warmth alone sometimes does the job within an hour.
2. Give calcium. Liquid calcium for poultry, calcium gluconate on veterinary advice, or as a farm improvisation a crushed calcium tablet dissolved in a little water, dripped slowly into the side of the beak. Calcium is what the uterine muscle needs to contract, and low blood calcium is the most common reason it cannot.
3. Warm bath. Sit her lower body in a basin of comfortably warm water (about 38 to 40 °C, warm to your wrist, never hot) for 15 to 20 minutes, holding her gently. The warmth relaxes the vent and pelvic muscles. Dry her afterwards and return her to the warm box.
4. Lubricate. With a clean, gloved finger, apply a little vegetable oil, petroleum jelly or a water-based lubricant to the vent and just inside. Do not push deep.
5. Wait. Give her an hour in the dark. Many hens lay within that time.
6. Repeat once. If nothing happens, repeat the bath and lubrication once more. If she has not laid within about three to four hours of the first attempt, she needs a veterinarian.

Treating a prolapse

A prolapse is more urgent than egg binding because of the pecking risk and because exposed tissue dries and dies. First, get the bird away from the others immediately. Then:

1. Clean the tissue gently with warm saline (a teaspoon of salt in half a litre of boiled, cooled water) or clean warm water. Remove any dirt, litter or dried blood.
2. Check for an egg. If an egg is visible inside the prolapsed tissue, it usually slips out with gentle lubrication once the tissue is clean. Do not tug on the tissue itself.
3. Reduce swelling. Tissue that has been out for a while swells and will not go back. A little sugar or honey applied to the tissue for ten minutes draws fluid out and shrinks it; this is an old trick that works. Rinse afterwards.
4. Replace it. With a lubricated gloved finger, push the tissue gently back inside the vent and hold it there for a minute or two. Some hens need this repeated several times over a day.
5. Keep her in the dark for two to three days with feed and water, to stop her laying while the tissue heals. Darkness suppresses ovulation.
6. Watch for infection. A vet may prescribe an anti-inflammatory or antibiotic. Follow the label and any egg withdrawal period.

Honesty is important here. A hen that has prolapsed once will often prolapse again, because the tissue is stretched. Hens that prolapse twice, or where the tissue is dark, torn or badly pecked, should be humanely culled. It is kinder than a slow death and it stops other birds learning to peck vents. Our guide on culling unproductive hens covers the decision.

Nutrient percentages are orientation values from common layer feeding standards; confirm your own ration with a nutritionist or your feed supplier, and confirm any medicine or deworming programme with your veterinarian.

The calcium story, explained properly

A Lohmann Brown or Isa Brown hen at peak puts about 2 grams of calcium into every shell, and she lays almost every day. She cannot eat that much calcium in one meal and hold it, so she draws on a special store in her long bones (medullary bone) during the night when the shell is forming, then refills the store from feed during the day. If the feed is short of calcium, or the calcium is in a form she cannot absorb, or she lacks vitamin D3 to absorb it, two things happen at once: shells go thin, and the blood calcium that her uterine muscle needs to push drops. Thin-shelled or shell-less eggs are much harder to pass, and the muscle is too weak to pass them. Egg binding follows.

This is why we insist that layer feed is not just "feed". A grower mash has roughly 1% calcium; a layer mash needs around 3.5 to 4%. Farmers who stretch grower feed into the laying period to save money, or who buy cheap "layer" mash of unknown formulation, get egg binding and thin shells within weeks. Free-choice oyster shell or crushed limestone in a separate trough lets each hen top up as she needs, and the large particles dissolve slowly overnight, exactly when the shell is being built. Our guide on eggshell quality and calcium goes deeper, and the layer feeding guide covers the full ration.

Pullet management: prolapse is usually decided before the first egg

A large proportion of the prolapse cases we see are in pullets between 18 and 25 weeks, in the first weeks of lay. Two mistakes cause most of them, and they are opposites.

Bringing pullets into lay too early. A pullet stimulated with extra light at 15 or 16 weeks may start laying before her pelvis and oviduct have finished growing. The eggs are small but her passage is smaller still. Some farmers do this deliberately to get eggs sooner; some do it by accident because the house is lit for the workers or has a security light shining in. Hold the light steady at the natural day length until the flock has reached its target weight (around 1.4 to 1.5 kg for a brown commercial pullet at 17 to 18 weeks, depending on the strain guide), then increase light gradually. Our lighting programme guide sets out the steps.

Overweight pullets. The opposite problem. Pullets fed a high-energy ration with no restriction, or kept on broiler-type feed, come into lay fat. Fat deposits in the abdomen narrow the passage, the vent tissue is weak, and these birds lay very large first eggs. They prolapse. Weigh a sample of 20 pullets weekly from 12 weeks and compare with the strain guide; if they are more than about 10% over, reduce the ration. Read our guide on feeding pullets to point of lay and point-of-lay management.

A mini case: 20 prolapses in a week

A farmer in the Kasoa area who had bought 1,000 point-of-lay pullets from another supplier came to us in distress. Twenty birds had prolapsed in seven days and the others were pecking them. We visited. The pullets were 19 weeks old, laying at about 30%, and had come from a rearing farm that had lit them from 14 weeks to get them laying before delivery. The new owner had also switched them straight onto 16 hours of light on arrival. On top of that he was feeding a grower mash because "layer mash is expensive and they are only just starting". Three causes stacked on top of each other. We had him drop the light back to 13 hours and increase by 30 minutes a week, move to a proper layer mash with oyster shell, remove every bird with a damaged vent, and dim the bulbs to reduce pecking. Prolapse stopped within ten days. He lost 26 birds in total; on a 1,000-bird flock that is 2.6%, painful but recoverable. On the same numbers at full lay for a year, those hens would have produced about 7,500 eggs.

Prevention programme for a Ghanaian layer flock

Bringing all of this together, here is the programme we recommend. It is not complicated, but every step has to happen.

• Rear pullets on a proper grower ration, weigh weekly from 12 weeks, and reach the strain target weight before any light stimulation.
• Do not light up before 17 to 18 weeks. Increase light by no more than an hour a week to a maximum of 16 hours.
• Switch to a pre-lay or layer mash at about 16 to 17 weeks so the medullary bone store is filled before the first egg.
• Provide free-choice oyster shell or coarse limestone from point of lay onward, in a separate trough.
• Keep the house cool: shade, ventilation, cool water, and feed early morning and late afternoon in hot months.

Frequently asked questions