Ben Carter
Candling is a method used to check if a fertilized chicken egg is developing properly. It involves shining a bright light through the egg to see what's going on inside without cracking it open. The term candling comes from the traditional practice of using candles to perform this procedure, but nowadays, a strong flashlight or a candler can be used. By observing the interior of the egg, you can identify signs of a healthy embryo, such as a dark shape, spider-like veins, and a visible air sac. It is recommended to candle fertilized chicken eggs around days 6 to 7 and again on day 14 to monitor the embryo's development and ensure the eggs' viability.
| Characteristics | Values |
|---|---|
| Definition | "Candling" is the process of shining a bright light against a fertilized egg to see what's going on inside without cracking it open. |
| Purpose | Identify fertile eggs, remove non-viable eggs, and monitor embryo development. |
| Timing | Can be done as early as day 3 of incubation, with key milestones visible at days 7, 8, 13-14, 18-19, and 20-21. |
| Equipment | A bright light source like a flashlight or a specialized candler, which can be handheld or placed on a flat surface. |
| Technique | Place the large/narrow end of the egg against the light source in a dark room. Look for a dark shape (embryo) with spider-like veins and an air sac. |
| Precautions | Clean and dry hands to prevent clogging egg pores. Return eggs to the incubator promptly to maintain heat and humidity levels. |
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What You'll Learn
How to identify a fertilised egg
To identify a fertilised chicken egg, you can use a process called "candling". This involves using a bright light source in a dark room to illuminate the interior of the egg. You can also use a flashlight or a modern computer to scan the egg.
Fertilised eggs will have a "bullseye" on the yolk, which is a white spot with a clear centre. This is the germinal disc, through which the sperm enters the yolk. The non-fertile germ spot contains only the female's cells and looks like a solid white spot. In a fertilised egg, the germ spot contains both the female and male cells, allowing the cells to divide and the spot to grow while the rest of the egg is built in the female's oviduct.
Another way to identify a fertilised egg is to look for intricate spider-like veins and a dark area indicating embryo development. After two to four weeks of incubation, you may see this dark patch in the shape of a fetus. However, it is important to note that fertilised eggs look just like unfertilised eggs on the outside, and there is no difference in taste or nutritional value.
It is also worth noting that the presence of a rooster is necessary for an egg to be fertilised. Rooster sperm can remain viable in a hen for several weeks, so even if there is no rooster currently present, the eggs may still be fertilised.
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How to remove non-viable eggs
Candling is a process used to assess the fertility and development of eggs, particularly during the incubation period. It involves shining a bright light through an egg's shell to observe its internal contents. This allows you to identify and remove non-viable eggs, which are infertile or have died early. This process helps prevent contamination, optimises incubator space, and improves hatchery efficiency.
To candle fertilised chicken eggs, follow these steps:
- Collect the eggs in the morning to protect them from dirt and predators.
- Choose medium-sized eggs, as smaller eggs have yolks that are disproportionate to the albumen and shell, while larger eggs often contain twins, resulting in neither embryo surviving.
- Store new eggs for a week at a temperature between 53° F-59° F (23.8° C-15° C). During this time, turn the eggs once a day, 45° each turn.
- On the seventh day, perform the initial candling to see if the egg is fertile. Shine a bright light against the shell of the egg, which should be done in a completely dark room.
- Place the large end of the egg, where the air cell is, against the light source.
- If the egg is fertilised, you will see a network of veins coming out of a dark blob close to the centre of the egg. This dark blob is the embryo, and the veins are its blood vessels.
- If the yolk appears solid or the egg looks clear, it is infertile and can be removed.
- On day 14, you can candle again to check on the embryo's development.
- By day 14, it may be harder to see inside the egg. However, you should still be able to see the veins beneath the developing chick.
- If the embryo has died, the egg will form a blood ring as the veins move away from it.
It is important to note that removing eggs from the incubator too frequently can decrease their chances of survival. Therefore, it is recommended to candle eggs once or twice early in the incubation process and then refrain from opening the incubator during specific periods. Additionally, it is best to limit candling to only two times to increase the chances of embryo survival.
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What to look for when candling
When candling fertilized chicken eggs, there are several key things to look out for to determine the egg's viability and the embryo's development. Here are some detailed instructions on what to look for when candling:
Day 3
Veins may start to become visible within the egg.
Day 6-7
A fertile egg will typically show a small dark spot, which is the embryo, with spider-like veins branching out and a visible air sac. The embryo will appear as a dark dot with spider-like veins spreading out around it. If the embryo is up against the shell, it may be easier to see and you might even observe movement or a heartbeat. If the egg is infertile, it will appear clear with no dark spot or veins.
Day 8
You may be able to see the embryo wiggling and kicking in the egg.
Day 14
By day 14, a healthy chick will occupy most of the egg. The egg will appear darker, with less light passing through, and you may observe continued movement. If the egg still appears clear or hasn't changed since day 7, it may be non-viable. The veins will be visible beneath the chick, and the yolk sac will start to be drawn into the embryo's body to provide nutrients for hatching.
Days 18-19
The yolk sac continues to be absorbed by the embryo, providing essential nutrients for the chick upon hatching.
Days 20-21
A membrane will surround the embryo, and you may observe internal "pipping," where the embryo uses its beak to poke through the membrane and starts breathing the air in the air sac.
Signs of a Non-Viable Egg
- Cloudy appearance or brownish tinge
- Lack of development compared to other eggs
- A distinct blood spot with little to no veins
- A vague ring inside the egg with minimal veins
It is important to note that candling requires practice, and it may be challenging to see the embryo initially. It is recommended to rotate the egg to find the best viewing angle and wait a day or two before trying again if you are unsure.
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How to candle without damaging eggs
To candle fertilized chicken eggs without damaging them, you must maintain the correct temperature and handle the eggs carefully. Here is a step-by-step guide:
Prepare the Environment:
Before you begin candling, create a suitable environment by turning off the lights or going into a dark room or closet. This will help you see inside the eggs more clearly. Additionally, ensure that your hands are clean and dry. Any oils from your fingers can clog the pores in the egg shell, restricting oxygen flow to the embryo.
Choose the Right Lighting:
You will need a bright light source to shine through the eggs. You can use a candle, a light bulb, or a flashlight. Alternatively, you can purchase specialized equipment like the Cool-Lite Tester, which minimizes handling time and provides a tight seal against the base of the egg, reducing the risk of dropping or damaging the eggshell.
Candling Technique:
Place the egg on a stable surface, such as an egg candler or a cardboard box with a hole cut out for the egg to sit on. Ensure the hole is just big enough for the light to shine through without the egg falling through. Gently rock the egg from side to side to move the contents without damaging the Chalazae, which holds the yolk and developing embryo.
Timing and Frequency:
The first week of incubation is critical for embryo development, so it is best to leave the eggs undisturbed during this time. After the first week, candle the eggs once a week to monitor progress and identify any non-viable eggs. You can candle again after 14 days, but avoid doing so during the last few days before hatching, as the chick is positioning itself to emerge.
Identifying Viable Eggs:
Fertile eggs will show a dark dot (the embryo) and spider-like blood veins spreading out. Sometimes, the embryo may be harder to see, so rotate the egg gently to get a better view. If you're still unsure, wait a day or two and try again. With practice, you'll be able to identify viable eggs more easily.
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How to candle in a dark room
Candling is the process of examining eggs to determine whether they are fertilized or not. It is a simple process that can be done at home with a candler or a flashlight. However, it is important to ensure that the room is dark to effectively see inside the eggs.
To candle in a dark room, start by turning off the lights or going into a dark closet or pantry. Place a towel on the work surface to cushion any dropped eggs. Then, hold the flashlight or candler in one hand and gently hold the egg with your index finger and thumb on the other hand, ensuring that no light leaks out from around the egg. Shine the light through the wide end of the egg, which is the air cell end, to illuminate the contents.
Examine the egg for signs of life, such as a dark spot, which indicates the embryo, and spider-like blood veins spreading out around the egg. If you are having difficulty seeing the embryo, try rotating the egg or turning it upside down so that the air sac is facing up. You may also need to adjust the brightness of your light source or try using a high-intensity OvaScope, which is specifically designed for candling dark eggs.
It is important to note that the darker the eggshell, the brighter the light required to examine the egg properly. Additionally, it is recommended to practice on unfertilized eggs first to get comfortable with the process and to minimize handling the eggs to avoid damaging the embryo.
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Frequently asked questions
Candling is a method used to check if an egg is fertilised and developing properly. It involves shining a bright light through the egg to see what's going on inside without cracking it open.
You can buy a candler from a farm store or online. You can also use a strong flashlight. Place the large end of the egg, where the air cell is, against the light source. If the egg is fertilised, you'll see a network of veins coming out of a dark blob close to the centre of the egg.
You can candle your eggs every day if you like, but after day 3 you should see something. It's recommended to candle twice: once on day 7, and once on day 14.
On day 7, a fertilised egg will show a small dark spot (the embryo) with red veins branching out and a visible air sac. By day 14, a healthy chick will take up most of the egg. Look for a darker interior, less light passing through, and continued movement.
