Tyler Brooks
Candling an egg is the process of shining a bright light through it to check for fertility and monitor embryo development. It is a common practice for chicken farmers to determine which eggs are viable and will hatch into chicks. When candling an egg, one looks for indicators such as a dark dot or shape, representing the embryo, and a network of spider-like veins or blood vessels spreading from it. The presence of these features confirms fertility, while their absence suggests infertility. Additionally, one may inspect the egg for cracks, which can introduce harmful bacteria and impede embryo development. Other signs of an unhealthy egg include a vague ring, a distinct blood spot, and a lack of development compared to other eggs. It is important to note that the type of egg can impact visibility during candling, with white eggs being the easiest to examine.
| Characteristics | Values |
|---|---|
| Before incubation | Check for cracks, which allow bacteria to enter during incubation. |
| During incubation | Identify fertile eggs by looking for a dark dot, the embryo, and spider-like veins. |
| During incubation | Remove non-viable eggs (infertile or dead) to prevent them from rotting and exploding. |
| Day 3 | Veins may start to appear. |
| Day 6-7 | Fertile eggs will show a small dark spot (the embryo) with red veins branching out and a visible air sac. |
| Day 7 | Check for early signs of life. If there are no veins or an air sac, the egg may not be developing. |
| Day 8 | Peep starts wiggling and kicking in the egg. |
| Day 14 | A healthy chick should take up most of the egg, with a darker interior and less light passing through. |
| Day 14 | Difficult to see inside due to the embryo filling up the space. |
| Day 14 | If the egg still looks clear or hasn't changed since Day 7, it is likely not viable and should be removed. |
| Day 18 | Some sources suggest candling again, but there isn't much to see other than the increasing air sac size. |
| General | White eggs are easiest to candle, while brown or speckled eggs are more difficult due to the shell's transparency under light. |
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What You'll Learn
How to identify a fertile egg
To identify a fertile egg, candling is a commonly used method. It involves shining a bright light through the egg to see what's inside without cracking it open. The process is simple and can be done with a strong flashlight or a household torch.
Here's a step-by-step guide on how to identify a fertile egg through candling:
- Prepare the necessary tools: You will need a strong light source, such as a flashlight or a household torch, and a dark room to work in. A bright light source is especially important if you are candling dark-shelled eggs.
- Cleanliness: Ensure your hands are clean and dry before handling the eggs. Oil from your fingers can clog the pores in the egg's shell, preventing the embryo from getting enough oxygen.
- Positioning: Place the narrow end of the egg gently against the light source.
- Observation: Look for the following indicators of a fertile egg:
- Day 3-4: Veins may start to appear.
- Day 6-7: You should see a small dark spot (the embryo) with spider-like veins branching out and a visible air sac. There may even be slight movement.
- Day 8: You may be able to see the embryo wiggling and kicking inside the egg.
- Day 14: A healthy chick will fill up most of the egg, resulting in a darker interior and less light passing through. Continued movement may be observed.
- Comparison: Compare the progress of the eggs. A non-viable egg may show no change from Day 7, remaining clear with no veins or dark spots.
- Record-keeping: Consider numbering each egg and jotting down your observations. This helps track progress and identify patterns during incubation.
- Returning eggs: Always return the eggs to the incubator as soon as possible and to the same position to preserve heat and humidity levels.
It's important to note that candling is typically done twice: once on Day 7 to check for early signs of life, and again on Day 14 to assess the development of a healthy chick. While candling can be done daily, it is best to avoid candling during the last 3 days before hatching unless there is a specific reason.
Additionally, it is worth mentioning that identifying fertile eggs through candling requires practice. With experience, you will become more adept at distinguishing between progressing and non-viable eggs, which is essential for managing your hatch effectively and preventing contamination.
Another way to identify a fertile egg is to crack it open and look for the "bullseye." A fertile egg will have a white "bullseye" on the yolk, consisting of both female and male cells, while an infertile egg will have a solid white spot or germinal disc through which sperm enters the yolk.
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How to identify an infertile egg
Candling is a process used to determine whether an egg is fertilised or unfertilised. It is a straightforward process that can be done with a household torch, although it is helpful to have some images to know what to look for. It is important to candle eggs to prevent the unpleasant mess that can occur when unfertilised eggs are placed in an incubator. Unfertilised eggs can create a gas buildup, leading to messy explosions.
To candle an egg, you must first store new eggs for a week at a temperature between 53° F-59° F. During this week, turn the eggs once a day at a 45° angle. Without this, the yolk can float and get stuck, preventing embryo growth. After this, the egg candling should be done in a completely dark room using a very bright light.
On day 7, you should be able to see a small dark spot, which is the embryo, with red veins branching out and a visible air sac. You may even see some movement. If you don't see veins or an air sac, the egg is likely infertile.
On day 14, a healthy chick will take up most of the egg. The interior will be darker, with less light passing through, and there should still be continued movement. If the egg still looks clear or hasn't changed since day 7, it is likely infertile.
Infertile eggs will look clear with no dark spot or blood vessels. The yolk will appear solid, or the egg will be completely clear.
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What to do with rotten eggs
Candling an egg is a straightforward process that involves examining an egg with light to check for fertility and development. It is typically done in a dark room, and a week after incubation. By observing the shadows within the egg, you can identify a fertile egg by the presence of a dark dot, representing the embryo, along with spider-like blood veins spreading out. With further development, the embryo becomes more visible, and you might even witness movement or the beating heart!
Now, when it comes to dealing with rotten eggs, here are some suggestions:
Disposal Options
- Trash Disposal: While it may seem unpleasant, throwing rotten eggs into the trash is an option. It is recommended to peel the shell and discard it in the regular garbage, while the rest can be placed in a food waste bag.
- Toilet Flush: Another option is to break the rotten eggs into the toilet and dispose of the shells separately in the trash.
- Boiling and Masking: If you need to boil rotten eggs, be aware that they will likely still emit an unpleasant odour. To mask the smell, you can add some broth to the water before boiling.
- Composting: Egg shells can be crushed into a fine grain and used as compost. They are rich in nutrients and can be spread throughout garden beds or planters to support plant growth.
Alternative Uses
- Garden Pest Repellent: Burying whole eggs alongside plants can help cure blossom end rot in plants like tomato plants. The eggs provide calcium and help the soil retain essential nutrients, promoting stronger plant growth.
- Bird Feeder: Crushed eggshells can be scattered in your garden to provide nutrients for birds, reducing the likelihood of them pecking at your produce.
- Seed Sprouting Aid: Half an eggshell can be used to help new seeds sprout in your garden.
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How to prevent bacteria
When candling an egg, you are looking to identify cracks, blood spots, or other undesirable contents, as well as to determine fertility and embryo development. This process involves shining a bright light into an egg to see inside it, allowing you to observe the embryo and remove non-viable eggs.
To prevent bacterial contamination during candling, follow these steps:
Keep Eggs Clean and Incubator Sterilized:
Dirty eggs or an unsterilized incubator can introduce bacteria to the eggs. Ensure that eggs are clean before placing them in the incubator, and always sterilize the incubator between uses to prevent the spread of bacteria.
Wash Your Hands:
Bacteria can be transferred to eggs through touch. Always wash your hands before and after handling eggs to reduce the risk of transferring bacteria. This is especially important if you are candling multiple eggs to avoid cross-contamination.
Identify and Remove Cracked Eggs:
Hairline cracks in eggs can allow bacteria to enter and cause infections, leading to premature embryo death. Before incubation, carefully examine each egg for cracks using candling. Remove any cracked eggs from the batch to prevent contamination.
Candle Eggs Regularly:
Candle eggs at regular intervals to monitor embryo development and identify any non-viable eggs. Early identification of problematic eggs reduces the risk of bacterial contamination in the incubator. Typically, candling is done on days 7 and 14, but you can candle daily if desired.
Maintain Proper Incubator Conditions:
Embryo deaths during incubation can often be prevented by maintaining optimal conditions in the incubator. Ensure the correct temperature and humidity levels to support embryo development and reduce the risk of bacterial growth.
Handle Eggs with Care:
Rough handling of eggs is a common cause of early embryonic deaths. Always handle eggs gently and return them to the incubator in the same position to preserve heat and humidity levels. Avoid keeping eggs out of the incubator for extended periods during candling.
By following these steps, you can significantly reduce the risk of bacterial contamination when candling eggs, improving the chances of successful hatching and maintaining a healthy environment for your embryos.
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What candling equipment to use
Candling is a process used to assess the fertility and development of eggs during the incubation process. It involves shining a bright light through an egg to observe its internal contents.
Candling equipment can be mains-powered or battery-operated. The two most common varieties are:
- A torch with a rubber seal around the end: This can be a small ultra-bright torch or a rechargeable LED torch. The latter is preferable as normal LED torches with batteries tend to dim over time. You can use your hand between the egg and torch to make a good seal.
- A table-top unit: This variety has a surface where you can place the egg. An example is the Titan Egg Candling device. This option is preferable if you don't want to hold the candling device.
In the past, before electric light bulbs, people used candles for candling. They would place a candle inside a wooden box with a hole big enough to allow light to shine through the egg but small enough to prevent the egg from falling into the box.
Today, automatic candling equipment is also available, which can illuminate entire trays of eggs.
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Frequently asked questions
A fertilised egg will show a small dark spot (the embryo) with red veins branching out and a visible air sac. You might even see movement.
An infertile egg will look clear with no dark spot or blood vessels.
You should candle eggs before putting them in the incubator to check for cracks, which can let bacteria in. You should also wash your hands before candling to avoid transferring bacteria to the eggs.
