Black Sex-Link chickens are productive brown-egg hybrids that can usually be sexed by color at hatch. They are often sold under names such as Black Star, but they are not a standardized chicken breed.
The classic Black Sex-Link cross uses a barred hen, usually a Barred Plymouth Rock, with a non-barred rooster such as a Rhode Island Red or New Hampshire. When the cross is made in the correct direction, the male chicks inherit barring from their mother and usually hatch with a light head spot. Female chicks do not inherit that barred Z chromosome and are generally dark or solid black at hatch.
For backyard keepers, the appeal is simple. You get active, useful laying hens, and hatcheries can identify pullets much earlier than they can with many ordinary breeds. The exact size, color, egg output, and temperament can vary, though, because different hatcheries may use slightly different parent lines.
Black Sex-Link Chicken Quick Facts
| Trait | What to expect |
|---|---|
| Type | Black sex-link hybrid |
| Other common name | Black Star |
| Recognized breed? | No |
| Classic cross | Barred Plymouth Rock hen × Rhode Island Red or New Hampshire rooster |
| Female chick | Usually dark or solid black |
| Male chick | Usually dark with a light head spot |
| Hen color | Usually black with red, copper, or gold leakage |
| Egg color | Brown |
| Egg production | Often around 250–300 eggs in a strong first laying year, depending on line and management |
| First eggs | Often around 18–24 weeks |
| Hen weight | Often around 5–6 lb |
| Male weight | Often around 6–8 lb |
| Temperament | Usually active and manageable; individual birds vary |
| Broodiness | Generally low |
| Main use | Egg production |
| Breeds true? | No |
What Is a Black Sex-Link Chicken?
A Black Sex-Link is a first-generation hybrid produced from parent birds chosen for a specific sex-linked color pattern.
The common backyard version is made by mating a barred hen with a suitable non-barred rooster. A Barred Plymouth Rock female crossed with a Rhode Island Red or New Hampshire male is the best-known example.
That does not mean every Black Star sold by every hatchery has identical genetics. Some hatcheries use their own selected strains or proprietary crosses. This is why mature size, red feathering, laying rate, and even temperament can differ from one source to another.
It is better to think of “Black Sex-Link” as a type of hybrid cross rather than a breed with one fixed standard.
Black Star vs. Black Sex-Link
These names are often used as if they mean exactly the same thing.
Black Sex-Link describes the genetic type. Black Star is a common commercial or hatchery name used for black sex-linked layers.
So a Black Star is usually a Black Sex-Link, but “Black Star” does not guarantee one exact parent combination unless the hatchery tells you what it uses.
How Black Sex-Link Genetics Work
The useful chick-color difference comes from the sex-linked barring gene.
Male chickens have two Z chromosomes, written ZZ. Female chickens have one Z and one W chromosome, written ZW.
The barring gene is carried on the Z chromosome. In the classic cross, the barred mother has one barred Z chromosome and one W chromosome. The non-barred father has two non-barred Z chromosomes.
Sons receive a Z chromosome from both parents. When a son receives the mother’s barred Z, he shows the chick markings associated with barring, including the light head spot. Daughters receive their single Z chromosome from the father and the W chromosome from the mother, so they do not inherit the mother’s barring gene.
That is why the direction of the cross matters. If you reverse the parents, you do not get the same reliable day-old sexing pattern.
Male vs. Female Black Sex-Link Chicks
With the correct first-generation cross, sexing is usually straightforward at hatch.
- Female chicks: usually hatch mostly black or very dark, without the obvious pale head spot seen in males.
- Male chicks: usually hatch dark with a light or white head spot caused by the inherited barring pattern.
As adults, hens commonly stay mostly black but develop red, copper, or gold around the neck, chest, or shoulders. Males often show more obvious barring, along with red or gold leakage from the non-barred parent side.
Do not expect every line to look identical. These are hybrids, so appearance can shift with the parent stock used by the hatchery.
Black Sex-Link Size and Weight
Most Black Sex-Links are medium-sized chickens with a practical production build.
Many hatchery lines put mature hens around 5–6 pounds. Males are often around 6–8 pounds, although some strains may be heavier.
This is another trait where the hatchery source matters. If mature size is important for your coop setup, check the breeder’s own expected weights rather than assuming every Black Star will reach the same number.
How Many Eggs Do Black Sex-Link Hens Lay?
Strong brown egg production is the main reason people choose this hybrid.
Many Black Sex-Link hens are capable of laying about five eggs per week during peak production. A realistic backyard range for a good first laying year is often around 250–300 brown eggs.
Some commercial descriptions advertise higher numbers, but it is better not to treat those figures as a promise. Genetics, nutrition, body condition, daylight, molt, stress, heat, disease, and individual variation all affect annual production.
The eggs are usually medium brown to brown and become large as the pullet settles into regular laying.
For comparison with other productive birds, see my best egg-laying chickens guide.
When Do Black Sex-Link Pullets Start Laying?
Black Sex-Link pullets generally mature fairly early. Many begin laying somewhere around 18–24 weeks.
Some strains may start sooner, while others take longer. Short winter days, a recent move, poor body weight, parasites, heat stress, or an incomplete diet can delay the first egg.
Early eggs may be smaller than the hen’s later eggs. Double yolks and odd shell shapes can also happen occasionally while the reproductive system is settling into a regular cycle.
You can read more about first-laying age in the pullet chicken guide.
Do Black Sex-Links Lay Through Winter?
They can be good cool-season layers, but no chicken is completely unaffected by winter.
Shorter daylight is one of the biggest reasons egg production drops during winter. Molt, age, cold stress, nutrition, and general health can reduce output too.
A young Black Sex-Link hen may continue laying better than an older or slower-producing breed, but it is not realistic to promise an egg every day through cold weather.
Temperament
Many Black Sex-Link hens are active, curious, and easy to manage. They often become comfortable around people quickly, especially when they are handled calmly and learn that you bring feed.
Individual birds still have individual personalities. One hen may follow you around the yard, while another prefers to keep a little distance.
Roosters vary even more. A Black Sex-Link male is not automatically aggressive, and he is not automatically gentle. Judge him by his actual behavior rather than the hybrid name.
In mixed flocks, watch feeder access and introductions just as you would with any other chicken. If one bird is being repeatedly chased away from food or water, add another feeding station and give the flock more room.
Are Black Sex-Link Hens Broody?
Broodiness is generally low in production-oriented Black Sex-Link hens.
That is useful if your main goal is eggs, because a broody hen stops normal laying while she sits. Still, “low broodiness” is more accurate than saying the hens can never go broody.
If one does hatch chicks, those offspring will not reproduce the same predictable Black Sex-Link combination.
Do Black Sex-Link Chickens Breed True?
No.
The day-old sexing advantage belongs to the original parent cross. Breeding a Black Sex-Link hen to a Black Sex-Link rooster produces a second generation with a mixed combination of genes from the original parent breeds.
The chicks may be perfectly healthy, but you cannot expect consistent color, size, laying performance, or reliable sexing by head spot.
To recreate the classic hybrid, you need the correct barred female parent and a suitable non-barred male parent again.
Feeding Black Sex-Link Chickens
High-producing hens need a complete, balanced diet more than they need a long list of supplements.
Start chicks on a complete chick starter. Move growing pullets to an age-appropriate grower or developer ration. Once laying begins, transition to a complete layer feed according to the feed label.
Active laying hens can have free-choice oyster shell for additional calcium. Keep oyster shell separate from insoluble grit. The two do different jobs.
Scratch grain, mealworms, greens, and kitchen scraps are fine in moderation, but too many extras can dilute the balanced nutrition of the main ration.
My chicken feeding guide covers the basic feeding routine in more detail.
Coop Space and Housing
Black Sex-Links do well in ordinary backyard housing as long as the coop is dry, well ventilated, secure, and not overcrowded.
For standard-sized birds, around four square feet of indoor coop space per chicken is a useful starting point when they also have a good run. More space helps when birds spend long periods indoors.
Provide sturdy roosts, clean nest boxes, dry litter, and enough feeder and waterer space that low-ranking birds are not forced away.
Use secure latches and hardware cloth where predators may reach through openings. My predator-proof chicken coop guide explains the main weak points to check.
Free Range and Foraging
Many Black Sex-Links enjoy foraging. They scratch through grass, leaves, and loose soil for insects and seeds and usually stay fairly active during the day.
That activity is good enrichment, but free range does not replace complete feed. What a chicken can find outside changes with season, weather, vegetation, and stocking density.
If local predator pressure is high, a spacious covered run can be safer than unrestricted free ranging.
Cold and Hot Weather Care
Black Sex-Links can adapt to a wide range of climates, but good management matters more than the hybrid name.
In winter, keep the coop dry and ventilated while blocking direct drafts at roost level. Make sure drinking water stays unfrozen. Single-combed birds can still develop frostbite in severe cold, especially when coop humidity is high.
In summer, provide deep shade, plenty of clean cool water, and moving air. Heavy panting, wings held away from the body, weakness, or a sudden drop in activity can signal heat stress.
Health and Reproductive Problems
Black Sex-Links do not have a special immunity to disease or parasites simply because they are hybrids.
They need the same basics as other chickens: clean water, balanced nutrition, dry housing, parasite checks based on actual risk, biosecurity, and quick attention when a bird changes behavior.
Because these hens can lay heavily, reproductive problems deserve attention as they age. Egg binding, prolapse, salpingitis, internal laying, and other reproductive disorders can affect high-output hens.
Calcium is essential for laying hens, but extra oyster shell does not prevent every reproductive condition. Overall nutrition, body condition, clean water, exercise, and early recognition of illness matter too.
Repeated straining, a swollen abdomen, unusual vent discharge, severe weakness, or a hen that stops eating should be taken seriously. If symptoms are severe or persist, seek veterinary or poultry diagnostic help.
Black Sex-Link Lifespan vs. Productive Years
It helps to separate two different questions: how long a chicken can live and how long she lays at her highest rate.
Black Sex-Link hens generally produce their highest egg numbers in the first one or two laying seasons. After that, annual production usually declines.
That does not mean the hen reaches the end of her life when production drops. A healthy bird may live for several more years, although there is no dependable Black-Sex-Link-specific lifespan that applies to every hatchery line.
Genetics, predators, disease, reproductive health, nutrition, and general care all have more influence on lifespan than a fixed number printed beside the hybrid name.
Are Black Sex-Links Good Meat Chickens?
They are primarily valued as egg chickens.
Surplus males and older hens can certainly be used for the table, and some hatcheries describe their lines as dual purpose. But Black Sex-Links do not match purpose-bred meat hybrids for growth speed, feed conversion, or breast yield.
If meat is your main goal, choose a chicken bred specifically for meat. If you want plenty of brown eggs and easy day-old sexing, Black Sex-Links are much better suited to that job.
Black Sex-Link vs. Red Sex-Link
| Feature | Black Sex-Link | Red Sex-Link |
|---|---|---|
| Hybrid type | Uses sex-linked barring | Uses sex-linked silver/gold color |
| Female chick appearance | Usually dark/black | Usually reddish or buff |
| Male chick appearance | Usually dark with light head spot | Usually much paler |
| Main purpose | Brown egg production | Brown egg production |
| Standardized breed? | No | No |
| Breeds true? | No | No |
Neither one is automatically better. The quality of the hatchery line, health of the chicks, and how well the birds fit your setup matter more than whether the sex-link is black or red.
Pros and Cons of Black Sex-Link Chickens
- Easy chick sexing: the first-generation cross lets hatcheries identify males and females by appearance at hatch.
- Strong egg production: many hens can produce roughly 250–300 brown eggs in a good first laying year.
- Early maturity: many pullets begin laying around 18–24 weeks.
- Manageable size: most lines fit well in ordinary backyard coops.
- Active temperament: many birds enjoy foraging and interact readily with keepers.
- Low broodiness: useful when steady egg production is your priority.
- Not a true breed: size, appearance, and production can vary between hatchery strains.
- Do not breed true: breeding the hybrids together does not reliably recreate the same chicks.
- Production declines with age: the strongest laying usually comes early in life.
- High-production health demands: reproductive issues deserve close attention as hens age.
Are Black Sex-Link Chickens Good for Beginners?
Yes, they can be a very practical first flock if your main goal is eggs.
They usually do well with standard chicken care, and buying sexed pullets reduces the chance of ending up with unwanted roosters.
The important part is not to mistake “productive hybrid” for “no-maintenance chicken.” They still need a balanced diet, fresh water, adequate space, predator protection, dry housing, and regular health checks.
Frequently Asked Questions
Is a Black Sex-Link chicken a breed?
No. It is a hybrid produced from parent lines chosen to create sex-linked chick markings.
Is Black Star the same as Black Sex-Link?
Black Star is a common hatchery name for Black Sex-Link chickens. Exact parent lines can vary by hatchery.
What color eggs do Black Sex-Link hens lay?
They lay brown eggs, usually medium brown to brown.
How many eggs does a Black Sex-Link lay?
Many good laying lines can produce roughly 250–300 eggs in a strong first laying year, although actual numbers vary.
When do Black Sex-Link chickens start laying?
Many start around 18–24 weeks, depending on the hatchery line, season, body development, and management.
How can you tell male and female Black Sex-Link chicks apart?
In the correct first-generation cross, females are usually dark without a clear head spot, while males usually have a light head spot caused by the barred gene inherited from their mother.
Can Black Sex-Link chickens reproduce themselves?
They can produce chicks, but the chicks will not reliably reproduce the same appearance, production, or sex-linked markings. You need the original type of parent cross to recreate the hybrid.
Are Black Sex-Link hens broody?
Broodiness is generally low, but individual hens can still go broody.
Conclusion
Black Sex-Link chickens make the most sense when you want practical brown-egg layers rather than a standardized show breed. Their biggest advantage starts on hatch day, when the correct parent cross makes the chicks much easier to sex.
As adults, the hens are usually active, manageable birds with strong early egg production. Just remember that “Black Star” does not describe one genetically identical chicken from every hatchery, so weight, feather color, temperament, and laying numbers can vary.
Give them complete feed, secure housing, enough room to move, and close attention to reproductive health as they age. For a backyard keeper who mainly wants eggs, they remain a useful and easy-to-understand hybrid.
Sources
- University of Kentucky: Sex-Linked Crosses
- Poultry Extension: Sex-Linked Traits in Poultry
- Hoover’s Hatchery: Black Sex-Link
- Murray McMurray Hatchery: Black Star
We have cinnamon queens i think they are called, but cant be sure we have only hens, wondering if they are hard to tell sex.?
The females are yellow with a reddish tint as chicks and the males are solid yellow with no red tint in what I’ve read online about them.
I own 4 Red Stars (each one year old) and 4 Black Stars (3 years old) and have had bad luck with all but one. I am very disappointed with these birds. The Black Stars (except for the one) are intermittent layers due to molting at inappropriate times and for 2 1/2 months in length, so there is no egg production then or afterward till they build up their strength and body weight. Two of my Black Stars are 2 years old and have stopped laying completely. They were the two who were also very broody, then they’d go into these weird molts.
My Red Stars are 1 year old and they haven’t laid eggs consistently at all because they are constantly in molt. One of the Red Stars appears to molt lightly on and off during the year, so she still lays eggs but not near the 300 as claimed.
As promoters say (even the US Government), these chickens do not breed true, and have a lot of health problems because they have been gene-spliced to produce 300-320 eggs each year***. Their bodies wear out more quickly, they are prone to bladder prolapse because those organs wear out, and they are prone to breaking bones. They produce too many eggs which sap their bodies of calcium. But promoters and even poultry books make false claims of how wonderful these gene-spliced chickens can be.
I have read (and believe it) that their lifespans are generally 3-4 years due to the abnormal egg production. The large egg producers don’t care how long their birds live because they are always sent off to slaughter at 1 1/2 or 2 years old. But why is this breed being sold to backyard chicken raisers? All this hoopla about this breed is false advertising, so don’t buy them. It is unnatural for a chicken to lay 300-320 eggs per year (although I fell for the claim too). Stick with the naturally bred chickens, not these GMO chickens. Science hasn’t figured out all the problems and mishaps with gene-splicing so don’t waste your money. Thanks for hearing me out.
*** https://www.farmforward.com/issues/genetic-modification/gmo-chicken/
https://pmc.ncbi.nlm.nih.gov/articles/PMC6189320/
Thanks for sharing your personal experiences with us and our readers. Yes, you are right hybrids means no gurantee. If we compare with broilers in few chicks grow very fast and few very slow and few never grow about 1 lbs. So, this is same with Black and Golden sex linked chickens. Sometime they dissapoint us.