Sophie Bennett
Determining a chick's age is a challenging task, especially as they grow older. In their early days, chicks are covered in a fluffy yellow coating called 'down', which they wear for about a week. After this, they gradually lose their down and small feathers begin to grow. By the fourth or fifth week, their fluffy appearance disappears, replaced by mature feathers. At this stage, their wattles and combs also start growing larger and turning redder. The number of feathers, colour of the comb and wattle, and the presence of down are all indicators of a chick's age.
| Characteristics | Values |
|---|---|
| Age | If a chicken still has some down, it is likely 12 weeks old or less. |
| Legs | Over time, a chicken's legs will grow thicker and rougher. |
| Spurs | Roosters get longer spurs as they grow older. |
| Hens can grow spurs, some from a young age, but mostly this happens in older hens. | |
| Colouring | Some breeds change colouring over time. |
| Molt | Chickens can go through a molt at different times for reasons that aren't seasonal. |
| Egg-laying | Most chickens start laying eggs within the four-week span of 16 to 20 weeks. |
| Hens that are 1-2 years old will often lay up to an egg a day. | |
| After they reach 2 years old, egg production begins to drop off. | |
| By the time a hen reaches 4 or 5 years old, she may lay eggs occasionally. | |
| Behaviour | Roosters begin to crow and mate less frequently with hens as they age. |
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What You'll Learn
Chickens have a three-stage life cycle
It is difficult to determine a chicken's exact age unless you have raised it yourself or have reliable information about its background. Chickens go through three key development stages during their lifetime.
Firstly, a chick is considered a baby chicken until it sheds its down, which usually takes around 12 weeks. After this, small feathers begin to grow. The chick stage is the first of the three life cycle stages. During this time, chicks are completely dependent on their mother, who maintain the optimum temperature for them to hatch. After about four to five weeks, the chicks have imprinted on the mother hen and will follow her almost everywhere. By the eighth week, the chicks are large enough to go outside and change their food items.
Secondly, the adolescent or pullet stage. Pullets are adolescent female chickens that are not yet adults. Pullets will start laying eggs around the 16- to 18-week mark, although this can vary between breeds. Once a pullet has laid her first egg, she becomes a hen, although some people consider a hen to be a chicken over one year old. Pullets younger than one year are sometimes referred to as hens, depending on the region.
Finally, the adult stage. An adult hen will usually lay one egg per day. After one year of monotonous egg-laying, the chicken gets exhausted, and they start laying irregularly. As they get older, hens will only lay occasionally, and the eggs may be larger than when they were younger. The adult stage is the final part of a chicken's three-stage life cycle.
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Young birds are easiest to identify
Young birds are the easiest to identify. Baby birds have a set of defining characteristics. They have short, fluffy, and dull-coloured feathers. Their heads are not fully formed, and their bills are much larger than their heads. They are unable to fly, so they prance or scurry about on the ground. They may also stay still and open their bills to demand food.
Young birds can be identified by their behaviour and appearance. If a bird is very young, it will stay still and open its bill to ask for food. Fledglings will prance about on the ground as they have not yet learned to use their muscles and feathers to fly. They can be placed on a perch, and they will grip it.
Young birds can be identified by their resemblance to adult birds. Ask yourself which adult birds the youngsters most resemble in size, profile, bill shape, and behaviour. Plumage colour and pattern are less important, as many young birds retain their juvenile plumage for several months until their first moult. For example, the young robin lacks the red breast of its parents, and the first scarlet feathers only begin to appear in autumn. Young mistle thrushes have a scaly appearance, which differs from the more uniform adults. Young goldfinches have a yellowish wash to their plumage, and lack the red face of the adult bird.
Young birds can also be identified by their developmental stages. Chicks are considered young until their last mini-molt is done. Once they have their large feathers, they are called pullets. Pullets are adolescent female chickens that are getting ready to lay their first eggs. They will have small, dry, and pale vents. After 12 months, pullets are considered hens.
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Chickens' physical features change with age
Chickens go through several developmental stages during their lifetime, and their physical features change with age.
Young chicks are easy to identify as they do not have a complete set of adult feathers. They begin life with a short-lived fluffy yellow coating called "down", which they wear for the first week or so of their lives. After the first couple of weeks, chicks gradually molt their down, and small feathers begin to grow in its place. A baby chicken can be considered a chick until it sheds all its down, which usually takes around 12 weeks. So, if a chicken still has some down, it is likely 12 weeks old or less.
From weeks 7 to 15, the physical differences between pullets and cockerels become more obvious. Pullets are teenage females, while cockerels are young males. During this time, pullets will have small, dry, and pale vents in comparison to hens. At around 16 weeks, roosters will have long and pointed hackle feathers on the sides of their necks, as well as long, skinny saddle feathers at the base of the tail that curve upwards. Roosters will also start to crow and will have large combs and wattles.
At 18 to 20 weeks, chickens will have their first feather molt. Guessing the age of a fully grown chicken that has had its first molt is challenging, but some features can help determine their age. A young cock will have short spurs, usually under 1 cm in length. By the time a rooster is two years old, its spurs may reach 2.5 to 3 cm in length.
Hens increase their body mass as they mature, and most have reached maximum plumes at nine months old. Once a pullet has laid its first egg, and a cockerel has started crowing and harassing the hens, they have reached adulthood. However, they are still growing and will reach their final size and weight at around one year. At this age, hens will usually lay one egg per day.
As hens get older, they will only lay occasionally, and the eggs may be larger than when they were younger. Some breeds continue laying into their fourth year, and some can live up to 10 years or more. Older hens may also develop spurs, usually much smaller than those of roosters. In addition, a chicken's legs will grow thicker and rougher with age, and any injuries sustained over time will become more prominent.
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Chickens' behaviour changes with age
Chickens go through three key development stages during their lifetime. They are considered chicks until their last mini-molt is done, after which they are considered pullets. Once they turn a year old, they are considered hens.
Young birds are the easiest to identify. Chicks do not have a complete set of adult feathers, beginning life with a short-lived fluffy yellow coating called down, which they wear for the first week or so of their lives. After the first couple of weeks, chicks gradually molt their down, and small feathers begin to grow to replace them. A baby chicken can be considered a chick until it sheds all its down, which usually takes around 12 weeks. So, if a chicken still has some down, it is likely 12 weeks old or less.
Once they are adolescents, pullets will start getting ready to lay their first eggs. A pullet will approach her point of lay sometime after week 16, though this can be up to 7 months with some breeds. She will remain a pullet until her first year is done. During this post-20-week period, pullets' combs and wattles will gradually become brighter and more pronounced.
When they become adults, hens will usually lay one egg per day. Roosters will start crowing and harassing the hens. At 18 to 20 weeks, the chickens will have their first feather molt. As they get older, hens will only lay occasionally, and the eggs may be larger than the ones they laid as young birds.
As they age, hens can tend toward obesity, especially if fed an improper diet or too many treats. Old hens, especially inactive hens fed too many grains, can accumulate enormous quantities of fat. Old hens will also have thicker and rougher legs and feet. They will develop rigid breastbones, compared to the more flexible breastbone of pullets. Seniors also have firmer muscles and thicker, tougher skin, compared to the soft muscles and papery thin, somewhat translucent skin of a pullet.
Older hens will also experience a decline in their egg-laying abilities. They will lay fewer eggs, and the eggs will have poor shell quality. They will frequently lay multiple-yolk eggs and might even start laying eggs at night.
Additionally, older hens might start crowing during non-laying periods, when male hormones exert greater influence than female hormones. Sex change in an older hen indicates she is reaching the end of her productive life.
In terms of their social behavior, chickens form a social hierarchy, often referred to as the "pecking order". As chickens age, they may decrease in rank within this pecking order. Stress or changes in the environment, such as the addition or loss of a flock member, can cause the hierarchy to collapse, leading to paired relationships being reestablished.
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There's no exact science to ageing chickens
There is no exact science to ageing chickens. However, there are some ways to make an educated guess about a chicken's age.
Firstly, it is important to understand the different life stages of a chicken. A chick is considered a baby chicken until it sheds all its down, which usually takes around 12 weeks. Once the chick has shed all its down, it is considered a pullet. A pullet will be getting ready to lay her first egg sometime after week 16, but this can vary with breed. Once a pullet has laid her first egg, she is considered an adult. However, she will not be fully grown until she is about a year old. At this point, she will be considered a hen.
One way to estimate a chicken's age is to look at its legs. As chickens age, their legs will become thicker and rougher. Spurs, which are present in both male and female chickens, will also get longer. However, this method is not foolproof, as spurs can be maintained over time.
Another way to estimate a chicken's age is to look at its feathers. Young chickens will have smaller, pointed feathers, while older chickens will have longer, more iridescent feathers. Chickens will also go through a moulting process as they age, which can be a sign of their approximate age. For example, if an adult chicken goes through a moult in late summer or early autumn, it is likely at least 18 months old.
Additionally, the comb and wattle of a chicken can provide some clues about its age. Young chickens will have smaller, less vibrant combs and wattles, while older chickens will have larger and more vibrant ones. As a chicken ages, the colour of its comb and wattle will begin to fade.
Finally, egg production can also be an indicator of a chicken's age. Most chickens will start laying eggs between 16 and 20 weeks of age. A hen that is one to two years old will typically lay up to an egg a day. After two years, egg production will begin to decrease, and by the time a hen is four or five years old, she may only lay occasionally.
In summary, while there is no exact science to ageing chickens, by observing their physical characteristics, behaviour, and life stage, one can make an educated guess about their approximate age.
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