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Poultry Questions and Answers

As an Extension Agent with a background in poultry, I receive many poultry questions concerning anatomy, biology, egg production, etc. The information below answers some of the most common questions received.


What is the average lifespan of a chicken?

Chickens can live for several years if their living conditions are correct. it is not uncommon for a chicken to live 6 to 10 years. However, most commercial laying hens are kept 2 to 3 years.

How old are chickens when they begin to lay eggs?

Under ideal conditions (correct nutrition, correct day length, proper housing & management), hens begin to lay eggs at around 20 weeks of age. There may be some hens that start a little earlier or a little later than the average.

My hen just hatched some chicks. What is the male/female distribution? How can I tell if the chicks are male or female?

Under normal conditions, a random mating results in a 50:50 ratio of male to female offspring. Determining the sex of newly hatched chicks is very difficult. Some cross-breeds result in differences in feather length of male and female chicks. However, these are accomplished under controlled conditions. In most cases you will have to wait until the chicks are older to determine the sex.

Hens can live for many years and produce eggs for much of that time. However, their productivity will decrease over time.

Hens can live for many years and produce eggs for much of that time. However, their productivity will decrease over time. Click the following link for more information on Factors Affecting Egg Production in Backyard Chicken Flocks.

Why have my hens stopped laying eggs?

Hens stop laying eggs for one of 3 reasons:

  • Disease has caused the hen to dramatically decrease or stop egg production,
  • The hen has been in production for a long time and she is beginning to enter a molt, or
  • The hen is not properly stimulated by light (hens require a certain amount of light during the waking hours for egg production).

Incubation, Embryology, & Eggs

Which part of the egg develops into the baby chick – the yolk or the white?

Actually, neither the yolk nor the white develop into the baby chick. A group of cells on top of the yolk, called the germinal disk, will develop into a baby chick, if conditions are right. in an unfertilized egg, the cells look like a small, pale dot. In a fertilized egg that has been incubated for a few hours, the disk is doughnut shaped. The egg white, or albumen, contains many antibacterial elements that help protect the developing embryo. The yolk is the nutrient source.

Will a double-yolked egg develop into twin chicks?

The short answer is no. While both germinal disks may start to develop after fertilization and the beginning of incubation, there is not enough room inside the shell to support the development of two chicks. Fertilized double-yolked eggs almost never hatch out; and if they do, only one chick will have developed.

I’ve heard that a small change in incubation temperature will influence the sex of the hatching baby chicks. Is this true?

The incubation temperature has no influence on the sex of the chick that hatches. In chickens, the chromosomes that determine sex are ZZ for male and ZO for female (compared to XX for female and XY for male in humans). The combination of the chromosomes is what determines the sex of the chick. Manipulating the incubation temperature will most likely result in fewer eggs hatching overall, but it will not change the sex of the chicks that do hatch.

In chickens, it is the female that determines the sex of the baby chick. This is exactly opposite of humans, where the male determines the sex of the offspring.


Fresh eggs at the farmers market downtown union street.

Fresh eggs at the farmers market downtown union street.

Which is better for you nutritionally, a brown-shelled egg or a white-shelled egg?

Egg shell color does not determine the nutritional properties of the egg. This is also true for fertilized vs. non-fertilized eggs. Hens that are fed a similar diet produce eggs with a similar nutrition profile no matter the color of the shell of if the egg is fertile. It is possible to slightly manipulate some of the nutritional properties of the egg by changing the diet of the hens, but this has to be done carefully. Simply put, an egg is an egg, insofar as the nutritional properties are concerned.

How can I tell what color eggs my hen will lay?

The breed of chicken determines the color of egg that she will lay. You can consult a breed handbook and that will give you that information. However, there is an easier way to determine what color of eggs your hen will lay. For the majority of hens (not all), the color of the earlobes will indicate the color of eggs. Hens with white earlobes lay white-shelled eggs, while hens with red earlobes lay brown-shelled eggs. Of course, there are exceptions to the rule, like the Araucana and Ameraucana, which lay eggs with a green-blue tint to the shell.

Poultry Meat and Egg Products

What causes blood spots in eggs? Are these eggs safe to eat?

Finding an egg with a blood spot is rare in commercially produced eggs (these eggs are usually taken out of the production line and discarded). However, you may find eggs with blood spots or meat spots from your backyard flock.

Blood spots are caused by the rupture of a blood vessel that carries materials to the yolk as it develops within the hen. As the yolk is deposited into the reproductive tract, the vessel ruptures and leaves a blood spot on the yolk. Blood spots do not indicate that an egg is fertile. These eggs are safe to eat. The blood spot can be removed with the tine of a fork or the tip of a knife.

Meat spots can also be found in eggs, although they are typically found in the albumen, or white, of the egg instead of on the yolk. A meat spot is a small piece of the hen’s reproductive tract that has sloughed off during egg formation. Eggs with meat spots are also safe to eat. The meat spot can be removed in the same manner as a blood spot.

I’ve heard that eggs from Aracauna chickens have no cholesterol. Is this true?

This is not true. Eggs from Aracauna chickens contain cholesterol in approximately the same amount as other chicken eggs.

Why do poultry have light and dark meat?

Like other animals, muscles in poultry perform different tasks depending on their location. This also means that muscles are used at varying rates. Muscles that are used a lot and over long periods of time require a lot of oxygen to perform well. There is a compound in these muscles called myoglobin. Myoglobin stores oxygen for use by the muscle and is very similar to hemoglobin, which is found in the blood. When myoglobin has oxygen stored for use it has a red color. Muscles that are used extensively contain a lot of myoglobin, thus resulting in the reddish, darker color. Muscles that are used less or for only short periods of time contain much less myoglobin and will appear lighter in color. This is why domestic chickens and turkeys have dark meat in the legs and thighs (muscles which get used a lot) and light meat in the breast and wing (muscles that only get used for short periods of time). In fowl that fly, such as wild ducks, there will be dark meat in the breast area as well as the legs and thighs.

Are hormones used to produce commercial poultry meat?

No. Hormones are not fed to or administered to commercial poultry. Federal law prohibits the use of hormones in poultry meat and egg production. The rapid growth rates, high egg production, and feed efficiencies seen in poultry today are the result of selective breeding, excellent nutrition, and good husbandry practices. Please note that poultry product labels cannot contain claims such as “No Hormones Added” unless it is followed by a statement that says “Federal regulations prohibit the use of hormones…” as this practice is against federal law.

Why do some chickens in grocery stores have yellow skin while others have white skin? Related…Why do some eggs have a darker yellow yolk than others?

The yellow color of the skin and the deeper yellow color of yolks comes from the ingestion of yellow and orange pigments. These pigments are found naturally in some of the ingredients that make up the poultry diet, such as corn. Grasses and other plants also contain these pigments. The pigments are absorbed from the feed and produce the yellow color in the skin and in the yolk. Another common pigment ingredient found in some poultry feeds is marigold extract. It is used for pigmentation purposes only. There is no nutritional difference in poultry meat or eggs derived from the difference in pigmentation.

How long will table eggs stay fresh?

Fresh eggs can be stored in refrigerated temperatures (40°F to 45°F) for 4 to 5 weeks after the packaging date on the carton. Hard-boiled eggs should be refrigerated and should not be kept for more than 1 week after cooking.

Salmonellosis is more common in the summer than in the winter. There are more than 2,500 serotypes of Salmonella known. For more information, click here.
How long can I keep fresh poultry meat? What about frozen poultry meat?

All fresh meats, including poultry, should be consumed or frozen within one to two days after purchase. Poultry meats that are frozen will retain their quality for 3 to 6 months in the freezer.


22 Comments on “Poultry Questions and Answers

    • If you have unwanted cockerels, check with the seller of the chicks. Most feed stores will take the cockerels back.

  1. I purchased a dozen commercial breed layer pullets from the local feed store.
    They are all adult and hens are laying, one turned out to be a rooster. Anyway,
    one of my barred rock hens disappeared and turns out she was setting on several eggs
    She was not in the hen house but in a sheltered area of brush. To hurry up the incubation,
    I took the eggs and replaced them with a few chicks from the feed store. She is a good mother hen.
    My question is, I thought that the brooding tendency had been bred out of the commercial layers.
    Now I see another adult laying hen, silver laced wyandotte, setting as well. I am quite surprised as this
    cuts down on the production for quite a while

    • Hi Janice,
      Pullets from a local feed store cannot be guaranteed for any specific traits. You may want to keep her away from too much bedding. It is recommended to put pullets in a wire bottom cage so that the nesting instinct cannot be encouraged. Nesting areas and warmer weather encourages broodiness in addition to eggs being left for them to sit on. Be sure and collect them daily so there isn’t a reason to sit, having a pole for them to roost on is better than nesting boxes if you are wanting to discourage broodiness.

  2. Im incubating 5 goose eggs in my home made incubator . It is incubating for about 3 days . I get the temperature at 37.4-37.7°C in the the thermostat . To double check the temperature I filled a plastic bottle with water and submerged 2 thermometers and closed the lid . After few hours when I brought it out both the thermometer’s reading was 98°F .

    I think it remained in that temperature for past 3 days .
    What should I do now ? Are these eggs still good enough to hatch ?

    • Goose eggs should be maintained at 37 C with 50-55% humidity. Sounds like everything is going alright for now! You can candle starting around day 8 to day 10 and check for development.

  3. Hello,
    What causes the albumen of a chicken egg to be lime green in color? I have been raising chickens for egg sales and personal consumption for roughly 15 years and every so often I will come across an egg that will have a greenish tint to the white. The color can range from almost neon green to a light hint of color. I haven’t sold any eggs this year so from all that our family has consumed we have noticed two eggs with the color change. There is no odor and I don’t know about taste because I always discard them. The flock is currently contained to their coop and have day long access to a bare ground run that I sprinkle with vegetation and scratch grains. The chickens range in age from 1 to 6 years. The floor of the coop is covered with a layer of white pine shavings and they are fed a layer crumble.

  4. I have a 5 week old chicken that I hatched out. 3 days ago I found it laying in the yard. It cannot stand. There were no visual marks. The chick can move both legs on its own. It is alert and eats, drinks, and poops with no problem. What is wrong with it?

    • Hi Shawna,

      It is difficult to say, but could be a condition we call “splayed leg”. Sometimes this can be remediated with splinting but it is best to seek veterinary advice.

  5. I have six hens. A couple of them have just begun to lay. However, one of the six has been acting strange. They are allowed outside their building during the day. She will often squat as if setting on a nest and ignore the activities of the others even when I throw feed.

    Last evening, I noticed she was not up on the higher roast with the others as usual but had roosted at a lower level. I’m concerned she may be sick. Any information is appreciated.


    • Hi Richard,

      We cannot comment on bird health or give treatment recommendations as we are not veterinarians. Any time you notice your chicken acting differently it could be a sickness or other behavioral explanation. I would reach out to a vet for specific consult.

  6. My question is that
    Can I put chicks in one house with separate water and feed day after day until this birds ready to go market

    • Chicks should be housed in groups according to their age. You should not mix ranging age groups as the older ones have the potential to injure younger ones.

  7. Good morning sir,
    Pls help me, I ve these layers I gave antibiotics to them. For seven days and the course of the drugs, they stopped laying, their weight reduced drastically.

    Pls. Sir what can I do, I don’t money for veterinary doc.

    • Unfortunately we cannot give veterinary advice and it is difficult to help you without more information on the birds.

  8. Hi, I have 5 duck eggs doing well in my incubator, one hatching next week and the others with a bit longer to go. I have had to lay 3 of them flat because they don’t fit properly and I now want to move them into a new incubator but am scared it might harm them to go from lying on their sides to sitting upright? Also they have been incubated at 38 degrees Celsius and I would like the new incubator to be set at 37.5,will the decrease in temperature be okay for them? Thank you so much for any advice.

  9. If a hen chick was blind from few days old,from Merck’s disease,Is she contagious immediately,or not until she gets sick again,much later.
    It’s stated by experts,that a blinded ocular Merck’s ,does not kill them.They can live several years.
    Are they contagious from early on?

    • The bird will continue to be a carrier for the disease. Her infectious load may be small but still has the potential to infect other birds and therefore it is best to humanely euthanize.

  10. Does a detached & floating air cell mean my fresh eggs are bad? I have a backyard flock & I gather eggs twice a day and candle them for blood spots. I have noticed a few have a floating air cell in them. Are they safe to eat or not.

    • Detached air cells are not a food safety concern. It generally means the egg was laid defective or it was handled roughly which broke the membranes that hold the air sac in place.
      As always, if you have food safety concerns is it easier to just toss the egg.