Maddie James
Candling is a method used to check if an egg is fertile and developing properly. It involves examining eggs with a bright light source in a dark room to see inside the egg. People who hatch their own chicks often candle eggs to check for cracks, bacteria, and signs of life. A fertile egg will show a small dark spot (the embryo) with red veins branching out and a visible air sac. An infertile egg will look clear with no dark spot or blood vessels.
| Characteristics | Values |
|---|---|
| Purpose | To check if an egg is fertile and developing properly |
| Timing | Twice: Day 7 and Day 14 |
| Equipment | A bright light source, ideally a modern LED version that does not give off heat |
| Environment | A dark room to see inside the egg better |
| Day 7 | A fertile egg will show a small dark spot (the embryo) with red veins branching out and a visible air sac |
| Infertile eggs will look clear with no dark spot or blood vessels | |
| Cracked eggs are likely to become infected, causing the embryos to die prematurely | |
| Day 14 | A healthy chick should take up most of the egg. Look for a darker interior, less light passing through and continued movement |
| The embryo is less active, so you are less likely to see movement |
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What You'll Learn
How to candle an egg
Candling is a simple method used to check if an egg is fertile and developing properly. The process 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 old-school practice of using candles, but nowadays, a strong flashlight or a modern LED light works just fine. Here's a step-by-step guide on how to candle an egg:
Prepare the Environment:
Before you begin, ensure you are in a dark room or closet to improve visibility. Wash your hands before and after handling the eggs to prevent the transfer of bacteria and ensure your hands are dry. Oil from your fingers can clog the pores in the eggshell, preventing the embryo from getting enough oxygen.
Choose Your Light Source:
Use a bright light source, such as a strong flashlight or a modern LED light designed for egg candling. These lights do not give off heat and are a better option for the eggs' well-being.
Examine Each Egg:
Place the narrow end of the egg gently against the light source. If the egg is infertile, you will see a clear inside with no veins or dark spots. However, if the egg is fertile, you will observe a dark spot (the embryo) with visible red veins and a visible air sac. The yolk (the dark blob) can move around a little, but if it moves excessively and resembles a swirling cloud, it indicates a broken yolk, and the egg won't survive.
Record Your Observations:
Number each egg and make notes on what you see. This helps in tracking progress throughout the incubation process. Take your time, but work quickly to preserve heat and humidity levels for the eggs.
Timing Your Candling:
The first candling is typically done on day 7 to check for early signs of life. By day 14, fertile eggs will be mostly dark with less visible light passing through, indicating that the embryo is filling up the space. Avoid candling during the last 3 days unless necessary, as the embryo is less active, and it becomes harder to see inside.
Additional Tips:
- Eggs can be out of the incubator for up to 30 minutes but return them as soon as possible to maintain optimal conditions.
- You can candle your eggs daily, but after day 3, you should start seeing signs of development, such as veins and blood vessels.
- Always return eggs to the same position in the incubator after candling.
- If you're having trouble viewing the egg contents, try using a stronger light source or a different angle.
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What a viable egg looks like
To identify a viable egg, one must look for signs of embryonic development. This can be done by holding the egg up to a candle or a strong light and observing its contents. This process is known as "candling".
A viable egg will have clear signs of embryonic development, such as a network of blood vessels, an opaque shape of an embryo at the larger end of the egg, and even movement within the egg. The embryo will be visible as a dark blob, which may move slightly when the egg is shaken. If the yolk moves around a lot and looks like a cloud swirling around rather than a solid round blob, it is likely a broken yolk, and the egg will not survive.
Another sign of a viable egg is the presence of a blastoderm, which is a white opaque circle with solid and pronounced edges. The blastoderm is surrounded by a lighter, almost transparent outer layer. Infertile eggs, on the other hand, will have an irregularly shaped blastodisc with a faint and foggy white colour.
It is important to note that the quality of an egg is dependent on the age of the bird, with older birds producing mostly abnormal eggs. Abnormal eggs typically do not fertilize or implant, but if they do, they can result in miscarriage or genetic disorders. Therefore, it is crucial to check for signs of embryonic development to ensure the viability of an egg.
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What an infertile egg looks like
Candling is a method used to check if an egg is fertile and developing properly. It involves examining eggs with a bright light in a dark room to see inside the egg.
An infertile egg will look clear with no dark spots or blood vessels. If you don't see any veins or an air sac, it's likely that the egg isn't developing. The dark blob formation in the centre of the egg is the yolk, which can move around a little, but if it moves around a lot and looks like a swirling cloud, it's likely a broken yolk and the egg won't survive.
Some people candle their eggs every day while they are incubating, but it is recommended to wait until around day seven. By day 14, a healthy chick should take up most of the egg, so it will be harder to see inside.
It is important to check eggs for cracks before incubation as they can allow bacteria to enter and cause the embryo to die prematurely.
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What a rotten egg looks like
It can be challenging to determine if an egg is rotten just by examining its shell. However, there are several signs and tests that can help you identify if an egg has gone bad. Firstly, it's important to note that eggs should be refrigerated and not left out at room temperature for more than two hours, as this can promote bacterial growth.
One of the most well-known tests for identifying rotten eggs is the float test. To perform this test, carefully submerge an uncracked egg in a bowl of cold water. If the egg floats, it is rotten, and you should discard it. If it sinks and lays flat, it is still fresh and safe to consume. If it sinks but stands on its end, it is close to spoiling.
In addition to the float test, you can also examine the appearance and smell of the egg. A fresh egg typically has a bright yellow or orange yolk that is solid and well-shaped, along with a thick, clear or slightly cloudy white. On the other hand, a rotten egg may have a flatter and discoloured yolk, and the egg white may appear runny, pink, green, or iridescent, indicating bacterial infection. Fresh eggs should not have any noticeable smell, but rotten eggs may emit an unpleasant, sulfuric odour.
It's worth noting that eggshells are porous and may absorb odours from their surroundings, so the smell test may not always be accurate. Additionally, while rare, salmonella in raw eggs is possible, and it is odourless, tasteless, and displays no visual cues. Therefore, it is crucial to combine multiple tests and always err on the side of caution when in doubt.
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Equipment for candling
Candling is the process of shining a bright light through an egg to see its contents. It is used to check egg viability and can help free up space in an incubator by identifying non-viable eggs. This process is typically done before incubation to look for cracks, blood spots, or other undesirable contents. It can also be done during incubation to identify fertile eggs and remove non-viable eggs, which could otherwise rot and explode, contaminating the other eggs.
There are a few different options for equipment when candling eggs. One simple method is to use a household torch, which can be a good option if you have a dark room to work in. If you are struggling to see the contents of the egg, turning off the lights or moving to a darker room can help. Alternatively, you can purchase a specialised egg candler, which can be powered by mains or batteries. These typically come in two varieties: a torch with a rubber seal around the end, or a tabletop unit with a specific place to sit the egg. Modern LED versions are recommended as they do not give off heat, which can be harmful to the egg.
When candling, it is important to remember that bacteria can be transferred to the eggs if you have not washed your hands. Additionally, eggs should not be left out of the incubator for longer than necessary, and the temperature of the egg should be maintained to prevent damage to the embryo.
It is recommended to candle eggs after seven days of incubation and again at 14 days. After a week, you can be reasonably precise about the viability of the embryo, and at 14 days, you can remove any eggs with embryos that have died to reduce the risk of explosion. Some sources suggest candling again at 18 days, but this is not standard practice.
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Frequently asked questions
On day 7, a fertile 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 should take up most of the egg. Look for a darker interior, less light passing through, and continued movement.
An infertile egg will look clear with no dark spots or blood vessels.
You will need a bright light source, such as a modern LED egg candler, and a dark room to candle eggs effectively.
