Tyler Brooks
Candling is a method used to check if a chicken egg is fertile and developing properly. It involves shining a bright light through the egg to see what's inside without cracking it open. The term candling comes from the traditional practice of using candles, but nowadays, a strong flashlight works just fine. Chick development takes about 21 days from the start of incubation to hatching, and most people candle twice: once on day 7 to check for early signs of life and again on day 14 to ensure healthy development. This process helps manage hatch expectations and prevent contamination and disappointment later on.
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What You'll Learn
How to identify a fertile egg
Candling is a process that involves shining a bright light into an egg to see its contents and determine whether it is fertile. This method is useful when hatching eggs at home, as it helps identify which eggs are fertile and will eventually hatch into baby chicks.
To candle an egg, you can make your own egg candler by placing a 60-watt lightbulb inside a coffee can with a 1-inch-diameter hole at the top. Alternatively, you can use a bright flashlight with a piece of cardboard covering the opening, with a 1-inch hole in the middle. For a more high-tech option, an Ovascope provides a rotating stand, a hood to block ambient light, and an eyepiece for magnified viewing.
Before placing the eggs in the incubator, candling can give you an idea of what an undeveloped egg looks like for future comparison. It is important to note that you cannot determine fertility before incubation, and candling at this stage is only useful for checking for cracks or damage to the eggshell.
After incubating the eggs for about a week, you can proceed with candling in a darkened room. You should be able to observe shadows, dark dots, embryos, and spider-like blood veins in fertile eggs. The embryo may be easier to spot if it is against the side of the shell, and you might even see movement or a visible heartbeat.
By day 14, the egg will be fuller, and it may be more challenging to observe the embryo. However, you might be able to identify specific parts of the developing chick, such as toes, eyes, or a beak.
It is recommended to limit candling to once or twice during the development process, as removing the eggs from the incubator can disrupt the incubation environment. Additionally, ensure that your hands are clean and dry before handling the eggs, as oil from your fingers can clog the pores in the eggshell and affect the embryo's oxygen supply.
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How to candle an egg from the side
Candling is a simple method used to check if a chicken egg is fertile and 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, but nowadays, a strong flashlight or an ultra-bright LED torch works just fine.
Prepare the Lighting and Environment
Ensure your hands are clean and dry before handling the eggs, as oil from your fingers can clog the pores in the egg shell, depriving the potential embryo of oxygen. If possible, use an ultra-bright LED torch or a similar bright light source. Turn off the lights or go into a dark room or closet to improve visibility.
Position the Egg
Place the narrow end of the egg gently against the light source. If you are using a handheld light, you may need to hold the egg with one hand and the light with the other. Alternatively, some modern candling devices are designed to sit on a surface, allowing you to place the egg on top.
Examine the Egg
Look for signs of development, such as a dark spot (the embryo) with visible veins. A fertile egg will typically show these signs by day 6 or 7. By day 14, a healthy chick should take up most of the egg, making it appear darker with less light passing through. If the egg still looks clear by this time, it is likely not viable.
Record and Return
It is a good practice to number each egg and make notes on what you observe. Return the egg to the incubator as soon as possible to preserve heat and humidity levels.
Remember, candling does not damage the embryos inside the egg, as long as you maintain the egg's temperature. It is generally recommended to candle eggs up to three times, as frequent removal from the incubator can cause temperature fluctuations that are harmful to potential embryos.
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How to candle an egg from the air cell
Candling is a simple method used to check if a chicken egg is fertile and 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, but nowadays, a strong flashlight works just fine.
- Prepare the eggs: If the eggs are shipped, allow them to rest in an incubator for a few days with the large end up and without turning them. For non-shipped eggs, you can begin candling as early as day 3 of incubation.
- Set up a dark room: Turn off the lights or go into a dark room or closet to improve visibility.
- Use a bright light source: A strong flashlight or the light from a cell phone works great. You can also use the flashlight app on your phone.
- Position the egg: For shipped eggs, always keep the air cell end up. Place the light source on the air cell, not the bottom end, as this will provide a better view. Do not turn or rotate the egg; instead, move the flashlight around it. For non-shipped eggs, hold the egg at a slight angle with the large end towards the light source.
- Examine the contents: Look carefully for indicators of fertility and development. On days 6-7, a fertile egg will show a small dark spot (the embryo) with faint blood vessels or spider-like veins surrounding it. By day 14, the egg should be mostly dark with less light passing through, indicating that the chick is filling up the space.
- Record and compare: It is helpful to number each egg and jot down your observations. This allows you to track the progress of each egg and identify any that may not be developing properly.
- Return eggs to the incubator: Eggs can be out of the incubator for up to 30 minutes, but it is best to return them as soon as possible to maintain heat and humidity levels.
Remember to always wash your hands before and after handling eggs, and avoid jiggling or sloshing the eggs, as this can harm the embryo. By following these steps, you can effectively candle chicken eggs from the air cell and monitor the development of your chicks.
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How to candle an egg in a dark room
Candling is a simple method used to check if a chicken egg is fertile and 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, but nowadays, a strong flashlight works just fine.
To candle an egg in a dark room, follow these steps:
Prepare the Eggs and the Room
Before you begin, ensure your hands are clean and dry. Oil from your fingers can clog the pores in the egg shell, preventing the embryo from getting the oxygen it needs. If possible, practice with eggs you aren't incubating to get a feel for the process without the stakes of fertilized eggs. Additionally, eggs can be out of the incubator for up to 30 minutes, but it's best to return them as soon as possible to maintain optimal conditions.
Candling requires a dark room to effectively view the interior of the egg. Turn off the lights or head to a dark room or closet.
Set Up Your Candling Device
Use a bright light source, such as a strong flashlight, for candling. If you're using a flashlight, experiment with the brightness settings to find the optimal level that allows you to see inside the egg without emitting too much heat that could harm the egg.
Examine the Eggs
Place the narrow end of the egg gently against the light source. You may need to rotate the egg to get the best view, as the embryo may be in the centre or opposite side of the shell. If you're still having trouble seeing, wait another day or two and try again, as the embryo will grow larger and become easier to spot.
Identify Fertile and Infertile Eggs
On Day 7, a fertile egg will show a small dark spot (the embryo) with red veins branching out and a visible air sac. The veins will resemble spider-like blood veins spreading out around the egg. An infertile egg, on the other hand, will appear clear, with no veins or dark spots.
By Day 14, a healthy chick will occupy most of the egg, resulting in a darker interior with less light passing through. If the egg still appears clear or hasn't changed since Day 7, it's likely non-viable.
Additional Tips
- Mark each egg with a number and record your observations to track changes over time.
- Always return eggs to the same position in the incubator to maintain heat and humidity levels.
- If you're candling dark-shelled eggs, you may find it challenging to see inside. Try adjusting the orientation of the egg or using a darker room to improve visibility.
- After 10 days, if the egg remains clear, it's likely non-viable.
- A distinct blood spot with little to no veins may indicate an egg gone bad.
Remember, candling is an exciting but delicate process. With practice, you'll become more adept at spotting the signs of chick development and managing your hatch with confidence.
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How to identify a bad egg
To identify a bad egg, you must candle it. Candling involves shining a bright light into the egg, allowing you to see its contents and check whether it is developing properly. It is best to candle eggs in a dark room, and you can use a special candling torch or simply the light from your phone.
After a week of incubation, you should be able to see signs of development in a fertile egg, including a dark dot, the embryo, and spider-like blood veins spreading out around the egg. If the egg is infertile, it will look the same as it did before incubation—fairly clear with no visible dark spots, blood vessels, or blood rings.
There are two types of early embryonic death: "early death" and "quitters." A thin ring around the inside of the egg indicates an early death, meaning the embryo died at the start of incubation. "Quitters" occur when the embryo starts to develop and then dies within the first week. You can identify a quitter by a distinct blood ring. If you are 100% certain that an egg is a quitter, you should discard it immediately to prevent it from turning bad and potentially exploding inside the incubator.
Other signs of a bad egg include a vague ring inside the egg and little to no veins, a lack of development compared to other eggs, and hairline cracks which can allow bacteria to enter.
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Frequently asked questions
Candling is a method used to check if a chicken egg is fertile and developing properly. It involves shining a bright light through the egg to see what's inside without cracking it open.
Wash your hands before and after handling eggs. Use a bright light source in a dark room. A strong flashlight works great! Place the narrow end of the egg gently against the light.
On day 6 or 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. If it still looks clear, the egg likely isn’t viable and should be removed.
