Tyler Brooks
Candling is a method used to check if an egg is fertile and developing properly. It is typically done in a dark room, using a bright light source to see inside the egg. The ideal days to candle eggs are days 3, 7, and 14 of incubation. By day 6 or 7, veins should be visible, and the egg will gradually darken until day 19 when only the air sac is visible. Candling can also be done on day 18, but it may be challenging to see details as the embryo takes up most of the egg by then.
| Characteristics | Values |
|---|---|
| Days to candle eggs | 3, 5, 6, 7, 8, 11, 14, 18 |
| Room type | Dark room |
| Equipment | Egg candler, bright low energy light bulb, cardboard box, modern LED torches |
| Egg colour | White, blue, green, brown |
| What to look for | Veins, air cells, embryo, dark shape, spider-like veins, blood vessels, air sac size, dark ring |
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What You'll Learn
Candling eggs on day 3
Candling is a simple method used to check if an egg is fertile and developing properly. It is typically done on days 7 and 14 of the incubation period. However, some people candle eggs as early as day 3.
On day 3, you may observe air cells and possibly some tiny veins in the eggs. However, it is important to note that the visibility of veins at this early stage depends on the colour of the eggs and the quality of your candling equipment and technique. With white eggs and good candling equipment and technique, you may be able to see some veins on the third day. But for blue, green, or brown eggs, it can be challenging, and you may need to wait until day 6 or 7 to observe veins clearly.
If you are candling brown eggs on day 3, you may observe a reddish-orange sphere on the yolk, indicating the beginning of development. By day 7, you should see more prominent veins and a darker colour in the eggs, indicating the growth of the embryo.
It is recommended to avoid making any decisions based solely on what you see on day 3, as it is still very early in the incubation process. The first few days of incubation are critical for embryo development, so it is generally advised not to disturb the eggs during this time. However, candling on day 3 can provide an early indication of fertility and help identify any potential issues.
Remember to handle the eggs with care during candling, as they are still incredibly fragile on day 3. Additionally, ensure you are using the correct candling technique by placing the eggs in a darkened room with a bright light source to observe the shadows and details within the eggs clearly.
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What to look for on day 7
On day 7, you should candle eggs in a dark room to be able to see shadows from inside the egg. If the egg is fertile, you will see a dark shape and spider-like veins. If it is infertile, the egg will look clear with no dark spot or blood vessels. You may also see a thin ring around the inside of the egg, which indicates early embryonic death.
A clear egg will not develop. The egg yolk will be seen floating towards the top of the egg before the air sac. However, it is harder to candle dark brown eggs, such as Copper Black Marans eggs, even in the dark.
By day 7, the embryo has grown significantly, and the eye is usually visible as the darkest 'blob' in the egg. There are digits on the feet, and the heart is enclosed in the thoracic cavity. Feathers also begin to grow from day 8.
If you are having trouble viewing the contents of the egg, turn off some lights or go into a dark room or closet. You can candle your eggs every day if you like, but remember to always return the eggs to the same position in the incubator and work quickly to preserve heat and humidity levels.
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Day 14 candling
Candling is a method used to check if an egg is fertile and developing properly. It is recommended to candle eggs after 7 days of incubation and again at 14 days. By day 14, the egg is getting full, and it is harder to see inside. If the egg is fertile, you will see a dark shape and spider-like veins by day 6 or 7. Infertile eggs will be clear with no dark spot or blood vessels.
On day 14, fertile eggs will be mostly dark with less visible light passing through, indicating that the chick is filling up the space. If there is no change by day 14, it could mean that the chick has stopped developing. It is a good idea to number each egg and make notes on what you see to track progress throughout incubation.
After two weeks of incubation, you can be reasonably precise about the viability of the embryo. At this stage, you can remove any eggs with embryos that have died to lessen the risk of a rotten egg exploding. It is not recommended to disturb the eggs again after 14 days, but some people may choose to recheck them when they stop turning a few days before they hatch.
Dark-shelled eggs, such as Marans or Welsummer eggs, are much harder to see through, so a bright light source is needed. Additionally, it is important to candle in a dark room to be able to see shadows from inside the egg.
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Candling in the final days
Candling is a method used to check if an egg is fertile and developing properly. It involves examining eggs in a dark room with a bright light source, such as an egg candler or a desk lamp with a bright low-energy light bulb. By observing the shadows and light passing through the egg, one can determine the presence of a developing embryo and assess its progress.
While candling can be performed as early as day 5 or 6 of incubation to check for fertility, the most common days to candle eggs are on days 7 and 14. After a week of incubation, one can be reasonably precise about the viability of the embryo. At this stage, a fertile egg will show a dark shape and spider-like veins, while an infertile egg will appear clear with no dark spot or blood vessels.
On day 14, the egg will be mostly dark with less visible light passing through, indicating that the chick is filling up the space. This is also the time to remove any eggs with non-viable embryos to prevent them from rotting and exploding. However, some people may choose to recheck the eggs a few days before they hatch, usually around days 18-25, to monitor the air sac size and ensure proper humidity levels.
During the final days of incubation, candling is generally not recommended as the chick is positioning itself to hatch. By this time, the chick almost fills the entire shell, making it difficult to see anything other than the increasing air sac size. Therefore, unless there is a specific concern, such as hatching problems or incorrect incubation humidity, candling during the last few days is considered unnecessary.
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How to build an egg candler
Candling is a method used to check if an egg is fertile and developing properly. It is usually done after 7 days of incubation and again at 14 days. To candle an egg, you need to darken the room and use a light source to see shadows from inside the egg.
Materials:
- A tin can with a removable top and a bright, shiny interior (a large coffee can works well)
- A piece of wood to mount the can on (a scrap piece of 2"x6" board)
- A piece of foam or something similar to pad the hole where the egg touches (avoid using black rubber)
- A lamp socket
Assembly:
- Drill small holes in the bottom of the can to screw the lamp socket to the centre.
- Drill a hole in the top and mount the on/off switch in a convenient location.
- Follow the instructions to hook up the cord to the light and wire it to the on/off switch.
- Install a 60-watt light bulb in the socket.
- Cut a small circle in the lid, just big enough for the egg to poke through.
- Glue the piece of foam around the hole to create a pad and prevent the egg from cracking.
Once your egg candler is assembled, place the egg with its broad end towards the light opening. You can gently roll the egg on the candler to get a better view. If the egg is fertile, you should see a dark shape and spider-like veins around Day 6-7. By Day 14, the egg will be mostly dark, with less visible light passing through as the chick takes up more space.
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Frequently asked questions
It is recommended to candle eggs on days 7 and 14 of incubation. However, some sources suggest candling eggs as early as day 3, 5, or 8, and again at 18 days.
Candling on days 7 and 14 provides a precise indication of embryo viability. By day 7, major veins should be visible, and by day 14, fertile eggs will be mostly dark.
While candling does not harm the eggs, it is not necessary to candle them daily. Candling every few days is sufficient to monitor the development and humidity levels.
The best days to visualize the embryo are days 7 and 14. After day 14, the chick takes up most of the egg, making it harder to see details. By day 18, only movement can be observed.
