Maddie James
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 process is typically performed at various points during the incubation process, such as around days 5-6, 9-10, and closer to the day of transfer to the hatcher. When candling eggs on day 10, one can observe the growth of the chick, an expanded air cell, and the chick's eye, which appears as a large black spot. It is important to handle the eggs gently during candling to avoid disturbing the delicate blood vessels and embryo.
| Characteristics | Values |
|---|---|
| Days to candle eggs | 7, 8, 10, 14, 16, 17, 18 |
| Best days to candle eggs | 10 and 18 |
| What to see on day 10 | Chick, air cell, eye, movement |
| How to candle | Use a bright light source, candle, flashlight, or candling devices |
| Preparation | Clean hands, dark room, avoid jostling the egg |
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How to candle eggs
To candle eggs, you'll need a dark room, a candler, and a way to record your findings. You can candle eggs as early as day 3, but it is recommended to wait until day 10, as the embryo and its delicate blood vessels will be more developed by then.
Candling on day 10 will allow you to see the chick, which should be filling up a lot of space within the egg. You should also see an expanded air cell and be able to spot the chick's eye as a large black bob. You might even catch a glimpse of some movement as the chick prepares to hatch.
- Ensure your hands are clean and dry to avoid getting oil on the eggs, which can clog the pores and prevent the embryo from getting oxygen.
- Create a dark environment by turning off the lights or using a dark room or closet.
- Remove the eggs from the incubator, being careful not to bump or jostle them, especially during the early days when the blood vessels are delicate.
- Use an empty egg carton to reposition the eggs for a better view if needed.
- Illuminate the eggs with your candler and evaluate their development. Look for indicators such as veins, blood vessels, and the size of the air pocket.
- Record your findings to monitor chick development and improve your hatch rate.
- Return the eggs to the incubator as soon as possible, ideally within 10 minutes to avoid overchilling.
It is recommended to candle eggs on days 10 and 18 for the best hatching results. Avoid candling after day 18, as the chicks will be positioning themselves for the hatch and should not be disturbed.
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What to look for
When candling eggs on day 10, you should see the chick, which should be taking up a lot of space in the egg. The air cell should be expanded, and you should be able to see the chick's eye, which will appear as a large black spot. You might even see some movement.
If you notice a clear egg (one with zero development), this is a sign that the egg is not developing and should be removed. Another sign of a bad egg is a vague ring inside the egg with little or no veins, which could indicate that the embryo is dead. A very distinct blood spot with little or no veins is another indicator that the egg is not developing properly.
It is important to avoid bumping or jostling the egg, especially during the early days, as the delicate blood vessels are still developing, and disturbing them could harm the embryo. If your incubator is set up so that the eggs are on their side, you may need to reposition them to get a better view. Using an empty egg carton to place the eggs temporarily is a good option.
It is also important to ensure that your hands are clean and dry when handling the eggs, as oil from your fingers can clog the pores in the eggshell and prevent the embryo from getting the oxygen it needs.
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Embryo development
On day 10 of embryo development, you may be able to observe the following:
- The nostrils are present as narrow apertures.
- Eyelids have grown to cover the eyes.
- The distal portion of the limbs has extended, with feather follicles covering the inferior part.
- An egg-tooth has appeared.
At this stage, the embryo continues to grow rapidly, along with a network of blood vessels that spread throughout the egg. The air cell also becomes more prominent as the chick needs oxygen to breathe. By day 11, the embryo takes on the aspect of a chick, with an elliptic-shaped palpebral aperture and fully formed eyelids.
By the ninth week of pregnancy, the embryo develops into a fetus, marking the end of the embryonic stage. This transition period is characterized by rapid growth and development, with the formation of distinct facial features, limbs, organs, bones, and muscles.
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Infertile eggs
To ensure the best hatching results, many sources recommend candling on days 10 and 18. By day 10, you should be able to see the chick, an expanded air cell, and possibly even some movement. However, it is important to note that the early days of incubation are delicate, and any jostling of the eggs can disrupt the developing blood vessel network. Therefore, it is generally recommended to avoid frequent candling during the first week.
On day 7, you can typically determine whether an egg is viable or infertile. A viable, fertile egg will display an embryo in the middle, surrounded by spider-like veins that stretch out into the yolk, supplying essential nutrients. In contrast, an infertile egg, or a "clear" egg, will only show the shadow of the yolk floating towards the top of the egg before the air sac.
While you can candle eggs daily, it is important to minimise disruptions to the eggs and maintain optimal incubation conditions. Each time you candle, ensure your hands are clean and dry to prevent oil from clogging the pores of the eggshell, which could hinder oxygen supply to the embryo. Additionally, limit the time eggs are out of the incubator and avoid prolonged removal of the incubator lid to prevent overchilling.
By candling on day 10, you can assess the development of the eggs and identify any problem eggs, such as cracked or infertile ones, that may need to be discarded. However, it is important to be cautious and not give up on eggs that appear to be lagging in development, as it could be due to factors such as viewing angle or other variables.
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Optimal timing
Day 10 is considered a key date for egg candling. By this time, the chick inside the egg has developed significantly, occupying a considerable amount of space. The air cell should be noticeably expanded, and you may even observe the chick's eye as a large black spot. Some movement of the chick may also be visible.
However, it is important to note that the timing of candling can vary depending on specific circumstances and preferences. Some people choose to candle eggs daily up to day 16 or 17, while others opt for specific days such as days 1, 7, 14, and 16. It is generally recommended to avoid candling during the last three days before the expected hatch, as the chicks are positioning themselves for hatching and should not be disturbed.
To ensure the best hatching results, it is crucial to handle the eggs with care and delicacy. The eggs should be removed from the incubator only when necessary and returned as soon as possible to maintain optimal temperature conditions. Clean and dry hands are essential to prevent oil from transferring to the eggshell, which could clog the pores and hinder oxygen supply to the embryo.
Additionally, creating a suitable environment for candling is important. A dark room or closet can enhance the visibility of the egg's contents when illuminated. Proper record-keeping of findings and monitoring chick development can also provide valuable data for future hatches, helping to improve hatch rates over time.
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Frequently asked questions
Egg candling is a process used to assess the fertility and development of eggs during incubation. It involves shining a light through an egg's shell to observe its internal contents.
Egg candling can be done at various points during the incubation process, such as around day 5-6, day 9-10, and closer to the day of transfer to the hatcher. The most recommended days for candling are days 10 and 18.
On day 10, you should be able to see the chick, which should be filling up a lot of space in the egg. The air cell should be expanded, and you may also be able to see the chick's eye as a large black spot and observe some movement.
It is generally recommended to candle eggs a few times during the 21-day incubation process. Some sources suggest candling daily until day 16 or 17, while others recommend candling only a few times on days 1, 7, 14, and 16.
Ensure that the room is dark to facilitate better observation. Wash your hands thoroughly before handling the eggs to prevent bacteria from penetrating the eggs. Avoid bumping or jostling the eggs, especially on day 10, as the embryos are delicate and vulnerable to disturbance.
