Why Do Chickens Moult? Understanding Their Annual Feather Renewal

If you keep chickens and have noticed them losing feathers and looking ragged at certain times, it's due to their natural annual moult.

This process helps them shed old feathers and grow new ones, ensuring their plumage remains healthy and protective. The moult generally happens in autumn, triggered by shortening daylight hours and cooler weather, signalling hens to slow egg production and focus energy on feather renewal.

Understanding moulting is important for responsible poultry care to maintain hen health and egg production in the long term.

When and Why Do Chickens Moult?

Chickens moult primarily to replace worn feathers, crucial for temperature regulation and waterproofing. Feathers become damaged over time; moulting renews the plumage to keep birds warm in winter and cool in summer. The moult is typically triggered by shorter days and hormonal changes related to the thyroid gland, coinciding with the end of a laying cycle.

Besides the annual autumn moult, environmental stresses like illness, poor nutrition, parasites, or bullying can provoke premature moulting. Young birds experience juvenile moults as they mature, with the first adult moult usually occurring at 15–18 months. Find chickens for sale to begin your flock responsibly.

Providing Extra Protein During Moult

During moult, hens stop laying eggs to divert energy to feather growth, which requires extra dietary protein. Offering a high-quality, protein-rich feed helps them rebuild feathers and store fat reserves for cold months.

Poultry keepers should provide this enhanced diet throughout the approximately 12-week moult period to support recovery and reduce the risk of illness. Find hens for sale from reputable breeders ensuring well-cared-for stock.

Minimising Stress During Moult

Moulting is physically demanding and can make chickens vulnerable to illness if stressed. Keep the environment calm, predator-free, and provide ample clean water and shelter. Avoid moving birds or introducing new flock members during moult to reduce stress and potential disease exposure.

A quiet, consistent routine and extra care help hens maintain condition and return to egg laying faster after moulting.

Order of Feather Loss and Moult Duration

Feathers fall off in a specific order during moult: head, neck, body, wings, and tail. New "pin" feathers emerge wrapped in keratin sheaths, which hens preen to uncover. These delicate "blood" feathers are prone to bleeding if damaged.

Some hens moult early or over extended periods, losing and regrowing feathers more gradually, usually associated with lower egg production. Others moult late and rapidly, often good layers with a brief ragged appearance.

The typical moult lasts around 90 days for healthy hens, with egg-laying mostly paused during this time but generally resuming when body feathers start to regrow.

Recognising Moult Symptoms: What to Look For

For new poultry keepers, moulting can look alarming. Before the visible feather drop begins, a hen’s plumage will take on a noticeably dull, lacklustre appearance. Then feathers start to fall, sometimes in large quantities over a short period, leaving the bird looking patchy or nearly bare in places.

As the moult progresses, you will see new “pin feathers” emerging from the skin. These are developing feathers still encased in a blood-filled keratin sheath, which is why they appear dark or almost black. Pin feathers have live blood supplies and are sensitive — handle moulting birds as little as possible to avoid causing pain or bleeding. Once the feather matures and the blood supply recedes, the sheath dries and can be preened away to reveal the new plumage. Fully formed feathers are no longer living structures and are not painful if touched or trimmed.

Annual Moult vs Stress Moult: Knowing the Difference

The annual moult follows a predictable seasonal pattern, typically beginning in late summer or early autumn as day length shortens. It proceeds in an orderly sequence from head to tail and lasts eight to twelve weeks for fast moulters, or up to five months for slow ones. Egg laying ceases or slows dramatically during this time.

A stress moult, by contrast, can happen at any time of year and is triggered by a sudden disruption — such as a shock from a predator, a dramatic change in diet, shortage of water, the introduction of new flock members, or illness. Stress moults are usually partial, often affecting only the neck feathers, and hens may continue laying at a reduced rate. If you notice feather loss outside of autumn without an obvious seasonal cause, investigate potential stressors in your flock’s environment before assuming it is a normal moult.

Best Foods to Feed Chickens During the Moult

Feathers are composed of approximately 85% protein, so the nutritional demands of regrowing a full set of plumage are significant. The best approach is to feed a high-quality complete layers feed throughout the moult and avoid diluting its protein content with low-protein treats such as mixed corn or scratch grains.

Good protein sources you can offer as supplements include mashed hard-boiled eggs (an excellent natural protein boost), dried mealworms in small quantities, and sprouted grains such as sprouted wheat or alfalfa, which increase both the quantity and quality of available protein. Avoid cat food as a supplement — while sometimes recommended in older poultry guides, DEFRA regulations in the UK prohibit feeding animal-derived proteins from non-poultry sources to chickens.

Ensure fresh, clean water is available at all times during the moult. Dehydration slows feather regrowth and increases stress. Adding a vitamin and mineral supplement or a small amount of apple cider vinegar to the water can support overall health during this demanding period.

Frequently Asked Questions

Is moulting painful for chickens?

Moulting is not inherently painful, but the growing pin feathers have an active blood supply and are sensitive to touch. Handling moulting birds gently and minimising unnecessary contact reduces discomfort. Once feathers are fully developed, they have no nerve supply and cause no pain.

When do chickens moult in the UK?

In the UK, the annual moult typically begins in late summer to early autumn, usually between August and October, triggered by decreasing daylight hours. The first adult moult occurs at around 15 to 18 months of age.

Why are my chickens moulting in winter?

Moulting outside of autumn is usually a stress moult caused by a disruption such as a predator scare, introduction of new birds, illness, or insufficient food or water. Investigate your flock’s environment and address any stressors promptly.