Chloe Adams
Candling is a method used to check if a chick 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 a specially designed candling device can be used. Typically, chick eggs are candled two to three times during their 21-day incubation period, with the first candling taking place around 6 to 8 days after the eggs are placed in the incubator.
| Characteristics | Values |
|---|---|
| First candling | Day 6-8 after placing eggs in the incubator |
| Second candling | Day 7 or 10 |
| Third candling | Day 14 |
| Final candling | 'Lockdown' day (Day 18) |
| Lighting tools | Cool-Lite Tester from GQF Manufacturing |
| Lighting tools alternatives | Flashlight, bare lightbulb, desk lamp, modern LED torches |
| Lighting tools setup | Place the narrow end of the egg gently against the light |
| Identifying infertile eggs | Clear inside, no veins or dark spots |
| Identifying fertile eggs | Dark spot (embryo) with visible red veins |
| Identifying eggs with dead embryos | Dark red streaking inside the egg, blood ring |
| Identifying "yolkers" | Clear without any signs of development, no blood vessels, no dark embryo, no blood ring |
| Identifying eggs with incorrect incubation humidity | Mark the size of the air sac onto the eggshell using a soft pencil and compare it with a known good egg |
| Monitoring humidity | Maintain the correct average humidity over the incubation period (45% for chicken eggs) |
| Monitoring air cell development | Make sure eggs are losing the appropriate amount of weight |
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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 traditional practice of using candles, but nowadays, a strong flashlight works just fine.
Here's a step-by-step guide on how to candle an egg:
- Prepare your workspace: Choose a dark room to reduce light pollution, as this will help you see what's inside the egg more clearly. Ensure your hands are clean and dry before handling the eggs. Oil from your fingers can clog the pores in the eggshell, preventing the embryo from getting enough oxygen.
- Use a light source: A strong flashlight or a specialized tool like the Cool-Lite Tester from GQF Manufacturing can be used. The Cool-Lite Tester minimizes handling time, reducing the risk of dropping or cracking the egg.
- Position the egg: Place the narrow or rounded end of the egg gently against the light source. Candling from the air cell (rounded end) provides a better view of the egg's interior, especially as the chick develops. However, in early development, candling from the side also works.
- Observe the egg: Look for indicators of fertility and development. A fertile egg will typically show a small dark spot (the embryo) with red veins branching out and a visible air sac. By Day 14, a healthy chick should occupy most of the egg, making the interior darker with less light passing through, and you may observe continued movement.
- Record and compare: Number each egg and make notes on your observations. This helps track progress during incubation and allows for easy comparison during subsequent candling sessions.
- Return the eggs: Place the eggs back into the incubator as soon as possible, preferably in the same position, to maintain heat and humidity levels.
Some additional tips to consider:
- Eggs can be out of the incubator for up to 30 minutes, but it's best to minimize disruptions.
- Candling before placing eggs in the incubator helps establish a baseline for comparison.
- Typically, eggs are candled up to three times during incubation, but you can do it more frequently if desired.
- Brown eggs may require checking for development later than white eggs due to the darker shell.
- If you're having trouble seeing inside dark eggs, try "the sniff test" to check for any foul odours or oozing, indicating bacterial overgrowth.
Remember, candling is a great way to monitor the progress of your eggs and manage your hatch more confidently.
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When to candle during incubation
Candling is a simple method used to check if an 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 old-school practice of using candles, but today, a strong flashlight works just fine.
It is recommended to candle at least three times during the 21-day incubation period to monitor the development of the air cell and to discard any non-developing eggs. The first candling should take place 6-8 days after the eggs are placed in the incubator. This will help establish a baseline for comparison. The second candling takes place about a week later, i.e., on day 14, to identify any eggs that have stopped developing.
During early development, candling from the side allows for a good view of the embryo, but as the chick develops, it becomes easier to see its development from the air cell (rounded) end of the egg. It is best to candle in a completely dark room at night to minimise light pollution and get a better view of what's happening inside the egg.
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, making the interior darker with less light passing through. If the egg still looks clear or hasn't changed since day 7, it is likely non-viable and should be removed.
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What to look for when candling
Candling is a simple method used to check if a chick 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 a specially designed egg candler works just fine.
Here's what to look for when candling chick eggs:
Day 3:
You may start seeing something by day 3. The first signs of a fertile egg are a small dark spot (the embryo) and the appearance of veins.
Day 6-8:
By day 6 or 7, a fertile egg will show a dark shape (the embryo) with spider-like veins. If you candle on day 8, you may even see the chick wiggling and kicking in its egg. The air pocket in the egg should be getting larger, and the egg will appear darker as it fills with more bird.
Day 14:
By day 14, a healthy chick should take up most of the egg. Look for a darker interior and less light passing through. If the egg still looks clear or hasn't changed since day 7, it's likely not viable and should be removed.
General Observations:
When candling, it's best to do so in a dark room to reduce light pollution, making it easier to see what's happening inside the egg. You can candle from the side in early development, but as the chick grows, it's easier to view its development from the air cell (rounded) end of the egg.
Additionally, always ensure your hands are clean and dry before handling eggs, as oil from your fingers can clog the pores in the shell and affect the embryo's oxygen supply.
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How to build a candler on a budget
To candle chick eggs is to check if an 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 old-school practice of using candles, but nowadays, a strong flashlight works just fine.
Materials:
- A good-sized metal can with a lid (a candy container, coffee can, or any canister with a tight-fitting lid will do)
- An ordinary light fixture
- Small nuts and bolts
- An electric cord
- An electric plug
- An in-line switch (optional)
- Gasket material, felt, or rubber
Instructions:
- Position the light fixture inside the can.
- Punch a few mounting holes in the bottom of the can and secure the fixture in place with nuts and bolts.
- Make an opening in the bottom of the can for the light's electric cord.
- Attach an electric plug to the free end of the cord.
- Add an in-line switch to the cord for convenience.
- Cut a 1 1/2" diameter hole in the lid of the can for illuminating the eggs. This is your "porthole."
- Glue a 2 1/4" diameter cork gasket around the opening to prevent eggs from cracking if they bump the can. You can cut your own from gasket material, felt, or rubber if needed.
- Add four legs to the side of the candler to allow for horizontal viewing.
Candling Tips:
- Always candle in a dark room.
- Gently roll the egg on the candler to get the best view.
- Eggs can be out of the incubator for up to 20-30 minutes before starting to cool down, so don't rush.
- It is recommended to candle eggs twice: once on day 6 or 7 to check for early signs of life, and again on day 14.
- In a fertile, hatchable egg, you will see a fine network of veins running out from a dark center.
- Infertile eggs will be clear inside, with no veins or dark spots.
Happy candling!
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How to prevent eggs from exploding
To prevent eggs from exploding, it is important to understand why they explode in the first place. Rotten eggs can sometimes explode, contaminating other fertile eggs and the inside of the incubator. As eggs rot, they build up gas and can explode, creating a smelly mess and exposing good eggs to bacteria from the rotten eggs. Therefore, it is important to candle eggs to identify non-viable eggs (infertile or early death) and remove them.
- Candle eggs regularly to check for viability: It is recommended to candle eggs at least three times during incubation to monitor development and discard any non-developing or infertile eggs. The first candling should be done before placing the eggs in the incubator to establish a baseline. The next candling takes place 6-8 days after they are placed in the incubator, and the final candling is done about a week later.
- Identify and remove rotten eggs: If you notice any eggs with a foul odor, oozing, or bacterial overgrowth, remove them from the incubator immediately. Rotten eggs are more likely to explode and contaminate other eggs.
- Maintain hygiene: Wash your hands before and after handling eggs to prevent the transfer of bacteria. Ensure that the eggs are clean before placing them in the incubator.
- Handle eggs carefully: Rough handling is a common cause of early embryonic death. Be gentle when moving and handling the eggs to avoid damaging them.
- Store eggs correctly: Store eggs at the correct temperature and humidity levels. Incorrect storage can lead to early embryonic death.
- Monitor air cell development: Ensure that the eggs are losing the appropriate amount of weight during incubation. Weight loss can be caused by humidity issues.
- Check for cracks: Hairline cracks in the eggshell can allow bacteria to enter, leading to embryo death and potential explosion.
- Avoid temperature fluctuations: Frequently opening the incubator can cause temperature fluctuations that are harmful to the embryos. Work quickly when candling eggs to preserve heat and humidity levels.
By following these tips and regularly candling your eggs, you can help prevent eggs from exploding and create a healthy environment for embryo development.
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Frequently asked questions
It is recommended to candle chick eggs for the first time after 6-8 days of incubation. This is when you will be able to see the first signs of life.
It is recommended to candle eggs at least twice, and no more than three times. The second candling should take place around 14 days after incubation.
When candling chick eggs, you should look for a dark shape and spider-like veins, which indicate a healthy embryo. If the egg is infertile, it will appear clear with no veins or dark spots.
