Introducing New Hens to an Existing Flock

Keep new hens completely apart for a couple of weeks first, so any health problem shows up before they mix. Then house them side by side behind mesh for about a week, mix them on neutral ground with extra feeders and hiding places, and expect some squabbling while the pecking order settles. Step in only if a bird is bleeding or can't eat.

See, but don't touch, at least for a week.

The introduction in four stages.

Introducing hens at a glance
Quarantine	A couple of weeks, fully apart
Side by side	About a week behind mesh
Mixing	Neutral ground, extra feeders and drinkers
Numbers	Introduce two or more at once
Step in	Blood, injury or a hen kept from food and water

Step One: Quarantine

New birds can carry mites, worms or infections that look fine at first. Keep them completely apart from your flock, ideally out of sight and well away from the run, for a couple of weeks; your vet may suggest longer. Use separate feeders, drinkers and boots, and check them daily. This step protects your flock more than any other.

Mite and worm treatments and vaccines: see your vet or a pet supply store with trained staff. Ask the seller what the birds have had, and ask your vet what your flock needs.

Step Two: See but Don't Touch

After quarantine, house the newcomers next to the flock, separated by mesh, for about a week. Both groups get used to each other's sight, sound and smell without fighting. A divided run or a dog crate inside the run works well.

Step Three: Mixing

Introduce at least two new birds at once, so no single hen takes all the attention.
Mix them where nobody "owns" the space, or rearrange the run first.
Put out extra feeders and drinkers, spread apart, so bullied birds can still eat.
Add hiding places and perches at different heights: a pallet leaned against the fence or a few straw bales.
Scatter some grain to keep everyone busy.
Some keepers move newcomers onto the perch after dark on the first night, so they wake up together.

Step Four: The Pecking Order

Chickens sort out a social ranking with pecks, chases and posturing. Some squabbling for a few days, sometimes a couple of weeks, is normal. Step in if a bird is bleeding (others will peck at red), is cornered with no escape, or is being kept from food and water: separate her, let her recover, and try again more slowly.

Size and age matter. Bantams and young pullets can be bullied by large hens, so wait until youngsters are close to adult size, or keep small breeds with small breeds.

The Law: Rules Differ by Country

Even a few pet hens can come with legal duties, mainly so that officials can reach keepers during a bird flu outbreak. Check what applies where you live before the birds arrive.

United Kingdom: In England and Wales you must register with APHA within one month of keeping poultry, whatever the number of birds and even if they are pets (see registering a small flock on gov.uk). Scotland has its own kept-bird register, and Northern Ireland keepers register with DAERA. During outbreaks, bird flu housing orders and prevention zones apply to backyard flocks too.
United States: There is no federal registration for backyard flocks, but city or county zoning often limits numbers, roosters and coop placement, and some states ask for premises registration. Your state department of agriculture or state veterinarian can tell you what applies.
Elsewhere: Ireland requires every poultry keeper, even with one or two birds, to register with the Department of Agriculture, Food and the Marine. Canada (CFIA and your province), Australia (your state or territory agriculture department) and New Zealand (Ministry for Primary Industries) have their own rules, especially during bird flu outbreaks.

Kitchen scraps: don't feed kitchen scraps to poultry. In the UK and the EU it is illegal, even for pet hens and even for vegetable leftovers, and many other countries restrict it because food waste can spread serious animal diseases.

Rules change, so check with your national authority before you buy.

Gear for Smooth Introductions

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A folding crate or a small separate coop handles quarantine. Welded mesh makes a see-but-don't-touch divider. Extra feeders and drinkers stop food guarding during the mixing stage, and a hanging treat holder or a straw bale gives everyone something else to think about.

Frequently Asked Questions

The questions keepers ask when adding birds.

How long should I quarantine new hens?

A couple of weeks is a common minimum, fully apart from your flock. Your vet may advise longer, depending on where the birds came from.

Can I add just one new hen?

It's better to add two or more at once. A single newcomer often gets all the attention from the flock.

How long does the pecking order take to settle?

Usually a few days to a couple of weeks. Some chasing and pecking is normal; blood, injuries or a hen kept from food are not.

Can I mix bantams with large hens?

Yes, with care. Small birds can be bullied, so give plenty of space, hiding places and extra feeders, and watch closely.

Should I add young pullets to adult hens?

Wait until they're close to adult size, and introduce them as a group behind mesh first.

What if one hen keeps attacking the newcomers?

Some keepers briefly remove the bully for a few days, which can reset her rank. If attacks continue, separate the newcomers and try again more slowly.