Buff Orpington vs ISA Brown: An Old Breed Against a Laying Hybrid

Here’s the short answer. The Orpington is a breed, introduced in England in 1886, and the Buff is one of its colors. An ISA Brown is a commercial laying hen, crossed from four lines by the company that sells it. Pick the ISA if you want the most eggs from the fewest birds. Its North America guide expects 330 eggs per hen housed by 72 weeks of age, in a laying house. Pick the Buff if you want a big, calm hen that will likely go broody and hatch you chicks. Meyer Hatchery puts a Buff at 4 to 6 eggs a week.

I rewrote this page from 11 sources, all listed at the bottom. For the ISA Brown, I read ISA’s own North America management guide, its European product guide for alternative housing and its ISA Brown web page. I also read the ISA Brown page of Hoover’s Hatchery, which sells the chicks. For the Buff Orpington, I read The Livestock Conservancy and the Buff pages at McMurray and Meyer. Cackle Hatchery’s too. And for what a small flock can expect, I went to two Penn State Extension pages and Alabama Extension’s sheet on feeding the laying hen.

A word on the photos. No free photo labeled as an ISA Brown passed my checks, so no hen here is named as one. None is named as a Buff Orpington either, though a few are buff colored. Two photos are by USDA photographers, on USDA’s Flickr page. Preston Keres shot the hen behind cage wire in March 2018, at a layer egg farm in San Sebastian, Puerto Rico. Lance Cheung shot the two eggs in July 2013, at Nick’s Organic Farm in Adamstown, Maryland. Tamsin Cooper took four of the photos (all on Flickr) between December 2016 and August 2019. Rachel Dunn’s backyard hens are on Flickr too, from June 2018.

The old page opened with a story I can’t back up. “I’ve been raising chickens on my little homestead for a few years now” is gone. So are the three Isa Browns added “last year”, and “gathering 5-6 large brown eggs from those three birds every single morning”. I cut the Buff roosters raised “last season specifically for meat”, along with the niece in the coop. Same for the Orpingtons “hand raised” from chicks. The hawk from “Just the other day” is out. So is the fox that grabbed a Buff hen “Last summer”. Out went the Isa hens “squawking” all day and the Buffs kept cool “above 85 degrees”. And so did the 4 square feet of coop space per Buff. I can’t show you any of that happened.

Most of the facts didn’t hold up either. Both birds were “dual-purpose breeds”, it said. Sure, The Livestock Conservancy lists the Orpington’s use as eggs and meat. But Hoover’s lists the ISA as an “Egg Layer”, and ISA’s own guide draws it as a cross of four lines. I read that as a hybrid, not a breed. It had ISAs “pumping out 5-6 eggs a day at their peak”. Not even ISA’s guide claims that. Its peak is 97% production, which I read as about 97 eggs a day from every 100 hens. It called ISAs “skittish and flighty”. Hoover’s says “Docile”. Penn State says sex-linked hybrids “tend to be more docile” than Leghorns, which it calls “much more flighty”. It said broodiness was “completely bred out of them”. Yet ISA’s guide has a whole section on broody hens. It had an ISA eating 1 pound of feed a week, and ISA’s guide works out to about 1.7. Noise had no source I could find. On predators, Cackle says the Buff’s “size and calm nature mean they still need good predator protection”. ISA and Penn State give general fencing and coop advice, but nothing I read compares the two birds. Nothing covers frostbite, either, or gives either bird a laying lifespan in years. On foraging and cost, my sources cover each bird alone, never side by side, so those lines are gone too.

The short version.

• The Orpington is an English breed, introduced in 1886, and the Buff came after the Black (The Livestock Conservancy). An ISA Brown is a commercial layer from “a multiple crossing process” (ISA’s guide).
• Eggs: ISA’s North America guide expects 330 eggs per hen housed by 72 weeks and 470 by 100 weeks. Penn State gives 240 to 280 a year for commercial sex-linked hybrids, and 200 to 260 for commercial egg-type birds. Meyer gives the Buff 4 to 6 a week.
• Size: a Buff hen runs about 8 pounds (the Conservancy). ISA’s guide sets its hen’s goal at 4.35 pounds at 100 weeks.
• Feed: ISA’s guide puts a laying hen at 113 g a day, about 1.7 pounds a week by my math.
• Broody: McMurray rates the Buff “extremely likely” to sit. ISA’s own guide has a section on broody hens, so don’t count on an ISA never sitting.
• Weather: Hoover’s calls the ISA “Cold & heat hardy”. McMurray rates the Buff’s heat tolerance “good” and its cold tolerance “excellent”.

One’s a Breed, the Other’s a Product

You can trace a Buff Orpington’s family tree. William Cook was a coachman in the town of Orpington, in Kent, England, The Livestock Conservancy says. He crossed Minorca roosters with Black Plymouth Rock hens, then crossed their offspring to clean-legged Langshans. In 1886 he introduced the Orpington, and the Buff was one of the colors he added after the Black. By 1902 the American Poultry Association had recognized the Buff Orpington. Then in 2016 the Conservancy took the Orpington off its priority list, and it “is no longer considered endangered”.

An ISA Brown has a company behind it instead. ISA stands for Institut de Sélection Animale. Its guide says it grew out of a 1975 push by France’s Ministry of Agriculture, through a merger of the poultry stock of Studler S.A. and I.N.R.A. Magneraud. On its website, ISA says “The ISA brand is offered at both the parent stock and commercial stock level”. Its North America guide draws the breeding scheme for you. Four pure lines are crossed in pairs to make two parent lines, and their chicks are the commercial layers. In the guide’s words, “Your commercials chicks are the results of a multiple crossing process which give the commercial layer a high potential for egg production”. My read: that makes an ISA Brown a laying hybrid, not a breed.

Hoover’s Hatchery adds a handy detail: “When they are hatched, the pullets are red, and the cockerels are white”. So you can tell the girls from the boys on day one. Looking out between the cage wires in this section’s photo is a brown hen on a layer egg farm in Puerto Rico. USDA’s caption doesn’t name her strain, so I won’t either. It does say the farm’s chickens “live under a dawn and sunset light-simulator”.

Eggs: 330 by 72 Weeks, in a Laying House

Here’s what ISA’s North America guide expects from a flock. It reaches a 50% rate of lay at 145 days (about 21 weeks, by my math) and peaks at 97%. Its target per hen housed is 260 eggs by 60 weeks of age, 330 by 72 weeks and 470 by 100 weeks. From 90% at 60 weeks, its target rate of lay slides to 67% at 100. ISA’s European guide for alternative housing has 371 eggs per hen housed by 80 weeks.

Now, those are laying-house numbers. ISA’s European guide says its figures are “based on many actual flock results obtained under good environment and managing conditions”. It says they “should be used as a guide only”. Penn State Extension writes for small flocks, and it says “Commercial sex-linked hybrids will lay 240 to 280 eggs a year”. My read is that an ISA Brown fits that group, since its chicks sort by color at hatch. So in a backyard coop, I’d plan on Penn State’s numbers, not the guide’s. Its laying-flock page adds “Most commercial-egg-type birds produce between 200 and 260 eggs a year”.

For the Buff, the numbers come from hatcheries, and they’re looser. Meyer Hatchery says Buffs “lay 4-6 brown eggs weekly”. If a hen kept that up all year, you’d get 208 to 312 eggs, by my math. But no hen keeps it up through a molt, which Penn State says takes about 10 to 12 weeks. Cackle Hatchery gives “150 – 280 eggs per year” and marks it “estimates only”. McMurray just rates the Buff’s egg production “good”. Asked how many eggs a Buff lays over her life, McMurray answered “Sorry, we do not have that information”. And The Livestock Conservancy calls Orpingtons “first-rate layers of large light to dark brown eggs”.

Penn State’s small-flock page is less generous to old breeds: “Common heritage type breeds will lay 50 to 100 eggs a year. There is also great variability between strains”. Its laying-flock page puts purebreds “between 100 and 180 eggs a year”. So the old page’s line that an ISA lays “more than double what a Buff Orpington can produce” is right or wrong depending on whose numbers you trust. Honestly, my read is that the strain you buy matters a lot, given that variability.

As for the old page’s “5-6 eggs a day”, the ISA’s 97% peak works out to just under one egg a hen a day. Why a hen lays about one a day is in our post on the 25-hour egg. On the left in this section’s photo is a double-yolker, held next to a large egg at an organic farm in Maryland. USDA’s caption says a farm assistant found it “during his checks on the health and safety of laying hens”.

Size: An 8-Pound Buff Hen Against a 4.35-Pound ISA

“Males typically weigh 10 pounds and females 8 pounds”, The Livestock Conservancy says of the Orpington. McMurray and Meyer list the same 10 and 8. Meyer adds that Buffs are “loosely feathered and appear to be heavier than their true weight”. You can see that look on the fluffy hen walking toward you in this section’s photo, though her Flickr page doesn’t name a breed.

An ISA hen is a lot lighter. ISA’s North America guide sets a body weight goal of 4.35 pounds at 100 weeks. Its European guide has 2,000 g at 100 weeks, about 4.4 pounds by my math. So a Buff hen weighs about 1.8 times what an ISA does, by my math. That’s a real gap.

My read: on meat, the old page was mostly right, except for its “rich yellow fat and skin”. McMurray says Buffs are “white skinned”, and Meyer lists their skin as white. Farmers of the mid-western states “favored the Buff Orpington chicken for its generally superior table qualities”, the Conservancy says. Its breed facts list the Orpington’s use as eggs and meat, with a market weight of 7 to 8.5 lbs. McMurray suggests “butchering Buff Orpingtons around 16-20 weeks of age”. For the ISA, Hoover’s lists one purpose, “Egg Layer”. In the ISA guides I read, you’ll find goals for eggs and feed, plus body weights, but none for meat. If you want weights by sex, and how to tell a Buff cockerel early, see Buff Orpington rooster vs hen.

Feed: About 1.7 Pounds a Week, Not 1

ISA’s North America guide puts average feed during lay at 113 g a hen a day. That’s about 1.7 pounds a week, by my math. Its European guide for alternative housing says 127 g a day to 80 weeks (about 2 pounds a week). Alabama Extension’s sheet on feeding laying hens says “A laying hen will consume between 100 and 150 grams of feed per day or roughly 0.25 pounds”. By its math, 10 laying hens go through a 50-pound bag in about 20 days.

So where did the old page land? It had an ISA eating 1 pound a week. That’s about 65 g a day, under Alabama’s low end of 100 g and well under ISA’s 113 g. It had a Buff at 1.5 pounds a week, about 97 g a day, just under Alabama’s range. I found no source with a Buff Orpington’s own feed number, so I won’t make one up for you.

ISA’s guide also gives feed per dozen eggs: 3.50 pounds. At that rate, a 50-pound bag from the feed store makes about 14 dozen eggs, by my math. But that’s the guide’s laying-house number, not a backyard promise. In this section’s photo, a black hen and a barred one peck beside a buff hen, and Rachel Dunn’s caption says they’re pecking for treats.

Penn State’s space rules don’t change by breed. Its small-flock page says “Build a coop that provides 2 square feet per bird of indoor space”. Its laying-flock page says “Allow at least 1.5 square feet per hen”, and for an exercise area, “5-10 square feet per bird”. My call: give a big Buff more than the minimum.

Broody Hens: Even ISA’s Guide Has a Section on It

My call: for a backyard flock, this is the biggest difference. McMurray rates the Buff “extremely likely” to sit, and says Buffs “make excellent setters and mothers”. Meyer calls them “very broody”. Cackle says “Orpington hens often go broody and can make excellent mothers for baby chicks”. It also warns that “broodiness can also pause egg laying”.

But an ISA Brown isn’t free of it. ISA’s North America guide says “Broodiness can appear in certain flocks in cases of stress or when they are generally underweight”. Its signs to watch for start with “staying in the nest” and end with “aggression”. And it says “preventing floor laying and frequent egg collection limits the amount of broodiness”.

A table in the guide, credited to B. Sauveur of I.N.R.A., shows what that costs you. A hen broody for 1 day pauses laying for 7 days, and one broody for 4 days pauses for 18. “The pause in lay depends upon rapid action”, the guide says. It advises moving broodies to a pen with no nest. Fast. Tamsin Cooper titled this section’s photo “Broody hen in confrontation”, and aggression is right there on the guide’s list of signs.

My call: collect eggs often, and if you don’t want chicks, get a broody hen off the nest early. If you do want chicks, the Buff is your hen. I covered broody Buffs in more depth in Buff Orpington vs Barred Rock.

How They Handle Cold and Heat

Both birds are sold as weather-tough. McMurray rates the Buff’s heat tolerance “good” and its cold tolerance “excellent”. It says “Their heavy, full plumage make them excellent winter layers, shelling out brown eggs right through cold weather”. Meyer calls Buffs “cold hardy”, and Hoover’s calls the ISA “Cold & heat hardy”.

ISA’s guide is more careful about it: “The laying house temperatures should be kept between 18-22°C, though the birds will withstand the lower temperatures during winter and higher temperatures during summer”. That’s about 64 to 72°F, by my math. It adds “At lower temperatures a hen increases feed intake”. My read: plan on a fuller feeder in winter.

For winter eggs, Penn State and ISA both talk about light. Penn State says “Provide 14-16 hours of light per day for maximum year-round production. Never decrease the lighting period on birds in production, or they will stop laying”. ISA’s guide calls for “15 hours of light duration at 50 % production”. Dust bathing in a barn’s straw in this section’s photo are a few hens and a rooster. The photo is dated December 17, 2016. Tamsin Cooper titled it “winter dust bathing in the barn”.

Which One I’d Pick

On temperament, the two are closer than the old page let on. McMurray calls Buffs “large, stately birds of quiet disposition” and rates their disposition “best”. Meyer says “Friendly, Calm”, and the Conservancy says “Calm, friendly disposition”. For the ISA, Hoover’s says “A docile bird, extremely easy to work with”. Penn State calls commercial sex-linked hybrids “a hardy yet docile bird, great for a small-flock setting”.

Think past the first two years, too. ISA’s guides stop at 100 weeks, a little under 2 years. Penn State’s small-flock page says “Chickens in most small flocks live 8 years, but they can live up to 12 to 15 years”. Its laying-flock page says hens “will lay fewer eggs, be less efficient, and will lay eggs for a shorter time with each additional cycle”. Tamsin Cooper titled this section’s photo “6-year old laying hen”. Her page doesn’t say whether she still lays, or name a breed.

Here’s my call. If you want the most eggs from a small coop, and you plan to replace hens every couple of years, get ISA Browns. If you want a big, calm hen that will likely go broody and raise chicks, get Buff Orpingtons and expect fewer eggs. And if the Buff is on your list, I’ve also put it against the Rhode Island Red and the Australorp.

Sources

• ISA: ISA Brown Commercial Management Guide, North America (PDF).
• ISA: ISA Brown Product Guide, Alternative Housing, EU (PDF).
• ISA: ISA Brown.
• Hoover’s Hatchery: ISA Brown.
• The Livestock Conservancy: Orpington Chicken.
• Murray McMurray Hatchery: Buff Orpingtons.
• Meyer Hatchery: Buff Orpington Day Old Chicks.
• Cackle Hatchery: Buff Orpington.
• Penn State Extension: Management Requirements for Laying Flocks.
• Penn State Extension: Successfully Raising a Small Flock of Laying Chickens.
• Alabama Cooperative Extension System: Feeding the Laying Hen, ANR-2913 (PDF).

Sources checked November 3, 2026. I read ISA’s guides as the breeder’s own targets for laying houses, not as a promise. The 21 weeks, the 1.7 and 2 pounds a week, the 4.4 pounds and the 1.8 times are my math. So are the 208 to 312 eggs, the 65 and 97 g a day, the 14 dozen and the 64 to 72°F. That an ISA Brown is a hybrid that fits Penn State’s sex-linked group, and that 97% means about 97 eggs a day from 100 hens, are my read. Which bird to pick is my call. We aren’t vets. If a hen stays broody, stops eating or looks sick, call a vet who sees poultry.

Related read: How to Raise Chickens for Eggs — Instant PDF download. Secure checkout by Stripe