Are Hylines (Isa Browns) for you?

Posted by Susan Lenz on

"Are Hylines right for me?"

Hylines are an incredibly popular chicken choice, and that is mainly because they are the producers of the big brown eggs that you buy on supermarket shelves. Although they have an excellent reputation for egg laying, 95% will meet this reputation, 4% will be mediocre layers and 1% complete dud layers. We are referring to an animal with has natural variances, not a machine (which honestly, I think some people forget sometimes).

Please be aware that the name ISA Brown (what HYLINES are often referred to) is actually a brand, much the same as Toyota or Samsung. The ‘ISA’ stands for “Institute de Selection Animale” – a French company that developed the breed in 1978 as a battery hen for optimum egg production. The ‘Brown’ refers to the chicken feather colour. There is also an ‘ISA White’ but this isn’t available in Australia. Biaida Poultry have the Australian rights to market the name ‘ISA Browns’.

Like everything that dominates the market, there are a other commercial hybrid chickens (such as Gingerham, Bonds Brown Hi-sex or Lohman) which are often indistinguishable in looks and egg production. Some sellers use the term ISA Brown quite loosely but upon further questioning will say that they ‘breed their own’ – please be aware that although they may be breeding a similar looking chicken that is robust, healthy and a great producer of eggs, they are not true ISA Browns. Either way you should be able to discuss the origins of your ISA Brown chickens from the person you are buying it from.

The ISA Brown, or HYLINE, is not recognised as a breed as it a hybrid, meaning that the girls (hens) hatch out a different colour to the boys (roosters) – ideal for the commercial egg industry. Also, if you mate the rooster to a hen you will not produce an ISA Brown chicken which is another component of producing a hybrid chicken. The ISA Brown is not a recognised in poultry shows and cannot be judged as there is apparently no breed standard for them. Word on the street has it that the genetic make up of an ISA Brown is a closely guarded secret, much like the secret recipes of some well known restaurants so this is a topic of much speculation in the chicken world. What is known is that there is a fair bit of New Hampshire chicken in there…


Hylines are a great starting point for people who are new to chickens as they get along with humans extremely well and will give you a fantastic number of eggs. They are a great choice for those with children, whether they are at home or in an educational setting. They can be quite affectionate, often happy to be patted or a cuddled – especially when they learn that you are the provider of food and treats!

They are however, quite ‘chookist’ in so far that once they are part of an established flock they can be quite brutal to newcomers. This can be overcome by ensuring that any new additions to a flock which has ISA Browns are of a similar size (if not bigger) and have plenty of room to run away until the new pecking order is established. We also recommend having more than one food and water station to decrease the chances of the newcomers being denied access to food and water by the more dominant ISA Brown.

Egg numbers

ISA Browns (or it’s brand name competitors) are the producers of the big, brown eggs that you will find in most egg cartons. Egg for egg, ISA Browns are a great value chicken producing over 300+ eggs for an initial investment of $35 per bird. This can only really be compared to other pure breed chickens or commercial layer strains of chickens which were used originally for egg production (i.e.. The Australorp or Leghorn). They are also bred to begin laying at around 20-22 weeks of age, much younger than the 24 weeks plus of a pure breed chicken.

One downside to the fact that they will lay abundantly for the three years of their life is the fact that the ISA Brown can look quite “moth eaten” and will often have a loss of feathers around its neck and/or bottom. This is because they will direct the protein they gain from food into egg production instead of feather production, but a boost of protein will help for feather regrowth and continue their laying.


Although Hylines have a reputation of not becoming broody, it is necessary to remember that in a commercial caged egg environment there would be at least 6 chickens in a space 1m wide and 50cm deep with no actual nesting area (or access to natural light really).

In a backyard setting, Hylines are in a much better environment and do become broody (and are capable of being good mothers to chicks). Again, we are talking about a living animal with natural urges. 

Life expectancy

More significant for the backyard chicken keeper (in our opinion) is the fact that the Hyline has a significantly reduced life expectancy compared to a healthy pure breed chicken – with a majority living for between 2-3 years. Some backyard chicken keepers report that their Hyline pets are living between 5-8 years but it should be noted, however, that this lifespan for an Hyline is in the vast minority as it simply isn’t what the chicken is ‘bred’ to do.

The decreased life expectancy is directly related to their high egg production – pure breed chickens will definitely moult, possibly go broody and a majority will take a break during the colder month to grow back their feathers (and rest their reproductive systems).

ISA Brown’s (and a lot of other commercial hybrid chickens) are bred to continue laying most of the year. This means that they won’t have the opportunity to rest their reproductive systems and will therefore develop tumours, cancers, prolapses and other health issues relating to their high egg production. Either that, or they will pass away from sheer exhaustion.

‘Rescuing’ a battery ISA Brown hen

Wanting to provide a home for a ‘rescued’ ISA Brown is very admirable but involves a different level of care to those who are bringing home a ‘normal’ chicken. We advise that you research the issue and gain as much information as you can on how to care well for the rescued girls for the remainder of their natural lives (and realistic expectations of what kind of life they may have outside of a commercial environment). 

‘Cheap’ ISA Brown warning

A word of warning about buying ‘cheap’ ISA Brown’s which are readily advertised. Primarily, how old is the ISA Brown that you are buying… often the cheaper the bird the older it is. Young ISA Brown chickens (or any chicken really) will have a small comb (top red bit) and wattles (dangly red bits under the beak) which get larger and redder the closer they get to laying age. If you are offered a ‘young’ ISA Brown who has a large comb and wattle, please ask questions to satisfy any doubts you may have… Buying a $5 – $10 ISA Brown with the expectation of getting the 300+ egg referred to on this website (and many others) can be unrealistic if the seller isn’t being as honest as they can be.

However, there are also honest sellers who can provide an ISA Brown at this price because of either their location (in rural areas, for example) or because the girls are much younger and will not be producing eggs in the next couple of week. Point of lay as an age reference, is around 20-24 weeks old – ISA Browns are bred to begin laying at around 22 weeks of age.

In summary…

All in all, ISA Brown’s are a fantastic beginners chicken or for those who are wanting a lot of eggs for their time/money/food conversion. In our experience you fall into one of three groups:

* Perfectly happy with the fact they have a reduced life span provided that you get value for money from the eggs they will produce. We are talking about a chicken, right? This group will either turn their girls into a meal once their egg production reduces (or finds other homes for them) and come back to us for another 4, 6 or 10…

* Buy them as a high egg production pet, looking after them and caring for them just as they would any other breed, grateful for the eggs while they get them and looking after their girls until they join the big chicken coop in the sky, whether they are laying every day or not at all…

* Me and/or the kids would be too devastated to loose a pet because of high volume egg laying reproductive issues. We would much rather have a pure breed that will give us less eggs per year (but more over their lifespan) and live longer…

So, which one are you? In answering this, you will also will determine if ISA Brown is the right type of chicken for you and your family…

A word of advice:

Hylines are the “athletes” of the chicken world and their nutritional requirements are similar to that of a marathon runner! they require a HIGH PROTEIN DIET to keep laying all those beautiful eggs for you and your family. If HYLINES are not provided a high protein diet, it will lead to nutritional deficiencies over time and they will start having health issues such as egg bound, egg perotinitis, oviduct issues and other nutritional deficiency issues which lead to other health problems, and can also lead to fatalities. WE CANNOT RECOMMEND FEEDING YOUR HYLINE A HIGH PROTEIN LAYER PELLET STRONGLY ENOUGH. Hylines that are fed a high percentage of table scraps are also often birds that start to have health issues. Bread, pasta, rice and oats are fillers that give the birds a false sense of fullness, and over time they lack in the important protein their bodies require.

We recommend: Laucke Showbird Breeder MP, Laucke 17, XTRA Egg 17%, or Country Heritage Certified Organic Pellet. Hylines also do well on Barastoc Top Layer Mash. We do not recommend Peckish Performance Layer Pellets or feeding Gamebird products to hylines.

Feeding grain leads to nutritional deficiencies with this type of bird over time, as they start picking and choosing what to eat from the mix (normally sunflower seed, corn which is the McDonalds of chicken food and should only be given as a treat !) which in turn leads to health problems and therefore we only recommend a grain as a treat and supplement to a high protein pellet based diet.  

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