Jessie Taylor
Quail eggs are notoriously difficult to candle, especially for beginners. However, most people own a smartphone with a decent light source, which can be used to candle quail eggs. Candling is a method to check the fertility of eggs, and involves checking for the presence of veins or an embryo in the egg. It is recommended to candle quail eggs between days 7 and 12 of their incubation period, as after day 13, it becomes difficult to see inside the egg.
| Characteristics | Values |
|---|---|
| Lighting | A bright light source is required for candling. Phone lights, iPod/iPhone lights, and flashlights can be used. |
| Room | Candle in a dark room. |
| Egg Handling | Have clean, dry hands. Be gentle and quick. |
| Timing | Candle from the narrow end on days 7-12 for best visibility. After day 13, the embryo is harder to see. Do not candle after day 15 to maintain humidity and allow chicks to move into hatching position. |
| Comparison | Compare eggs to others in the same batch. |
| Embryo Development | Observe the shadow of the chick, usually on the blunt end of the egg. Veins may be visible from day 5. |
| Egg Appearance | Quail eggs may appear green due to a combination of a faintly blue interior and yellow tint from compounds in the yolk. |
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What You'll Learn
Candling light test
Candling is a process used to check the fertility of eggs. Quail eggs are particularly difficult to candle, especially for beginners, due to their small size and dark shells. However, with practice and the right tools, it is possible to effectively candle quail eggs.
The candling light test involves shining a bright light through the egg in a dark room to observe the interior. A smartphone flashlight can be used as a light source, but ensure it is bright enough to show any veins or embryos. The angle of candling is important, as exposing the most visible detail at a given day of development is crucial. For quail eggs, the narrow end of the egg is usually the best angle to use.
It is best to candle quail eggs between days 7 and 12 of incubation for optimal visibility. After day 13, it becomes more challenging to see inside even a good egg. Additionally, it is recommended to avoid candling during the lockdown period (around day 15) to maintain humidity and allow the chicks to move into hatching position.
When candling quail eggs, it is normal to observe various colours, such as yellow, red, green, or blue. These colours can be a result of the light source, the compounds in the egg, or the development of blood vessels. It is important to compare eggs within the same batch and not to panic if veins or embryos are not visible, as this is common with quail eggs.
Practicing candling and observing reject eggs can provide valuable insights into embryo development and the incubation process. It is also important to remember that some eggs may fail, regardless of technique, so learning from these experiences and continuing to incubate is essential.
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Humidity and egg turning
Humidity plays a crucial role in the successful hatching of quail eggs. It regulates moisture loss from the eggshells, creating the air cell the chick will breathe from during hatching. If the humidity is too high, the chick could drown, and if it's too low, the inner membrane dries out, making it challenging for the chick to hatch.
To achieve optimal humidity levels, it is recommended to maintain 45–50% relative humidity for the first 14 days of incubation. Subsequently, for the final 3 days before hatching, humidity should be increased to 65–70%. This balance ensures that embryos have sufficient time to develop while also preparing them for a safe hatch.
It is essential to monitor humidity levels closely, as even small shifts can significantly impact hatch rates. One way to assess humidity levels is to examine the growth of the air cell within the egg. By candling the egg, you can observe the size of the air cell and adjust humidity accordingly. If the air cell appears too small, increase humidity, and if it looks too large, lower the humidity.
Additionally, it is recommended to use a separate digital thermometer and hygrometer placed at egg level to obtain accurate, real-time readings of temperature and humidity. It is also advised to run the incubator for at least 12 to 24 hours before introducing the eggs to ensure stability and make any necessary adjustments.
During the lockdown period, when chicks move into position to hatch, it is crucial to maintain high humidity to aid the chick in hatching and prevent the egg from drying out or shrink-wrapping. Consistency in humidity and temperature is vital, as significant fluctuations can negatively impact embryo development and lower hatch rates.
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Using a phone light
Quail eggs are difficult to candle, especially for beginners. Using a phone light is a good option, as most people have access to a phone with a decent light source.
To candle quail eggs with a phone light, start by ensuring you have clean, dry hands. Work in a dark room, and shine the light into the fat side of the egg. Cup your hand around the light, leaving a small opening between your thumb and index finger. Lay the egg on its side on top of this opening. If the egg is light-coloured or clear, you should be able to see inside. Candle from the narrow end during days 7-12 for the best visibility; after day 13, it becomes difficult to see inside a good egg.
If the light shines straight through the egg, it is clear. If the egg looks dark with a small air sac at the top, it is fertile. During the first week, you may see one or two red veins, and the chick should develop from the embryo. On day 8, you can candle to check things are progressing. On day 9, you can check for infertility, and on day 15, you can check for quitters. Over-candling can harm an embryo, and shining a bright light close to hatching day may scare or harm the chick.
It is worth noting that phone flashlights may not be bright enough to show veins, and the light may be too weak. A proper candler is a worthwhile investment if you plan to hatch more eggs in the future.
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Egg fertility
Quail eggs can be candled to check their fertility. This process involves shining a bright light through the eggs in a dark room to check for signs of development. If the egg is fertile, you should be able to see a network of blood vessels, a developing embryo, or even movement. Infertile eggs will appear clear, with no veins or dark areas visible.
To candle quail eggs, you will need a specialised egg candler or a small, powerful flashlight. The room should be darkened, and the eggs should be held gently so that the light shines directly through the shell. It is recommended to candle quail eggs after at least 3 days of incubation, with the sweet spot for Coturnix quail eggs being 7-10 days into incubation. By this time, clear signs of development should be visible if the egg is fertile.
It is important to note that over-candling can harm an embryo, so it is recommended to candle quail eggs only a few times during the incubation period. Some sources suggest candling on days 5-9 to check for infertility and again on day 15 to check for quitters. Others recommend candling only once a week.
In addition to candling, another method to check the fertility of quail eggs is to crack them open and examine the yolk. On the surface of the yolk is a small white spot called the germinal disc. This spot is present in both fertile and infertile eggs, but it appears differently in each case. In fertile eggs, the germinal disc resembles a bullseye, with a distinct, circular white ring and a more defined centre. In infertile eggs, the spot is smaller, more solid white, and lacks the ringed appearance.
By understanding the fertility of quail eggs through candling or examining the yolk, you can improve your hatch success rates and avoid wasting time incubating infertile eggs.
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Incubation period
The incubation period for quail eggs is quite short, lasting around 16 to 20 days. Coturnix quail eggs, in particular, hatch in 18 days on average. During the first 14 days, the humidity should be maintained at 45-50%. From day 15 onwards, the humidity should be increased to 65-75% to prepare for hatching.
It is recommended to candle quail eggs around day 7, as the embryos should be large enough to see at this point. However, some sources suggest candling between days 12 and 15 to ensure each egg is developing. Candling involves monitoring the fertility and development of the eggs and identifying any non-viable eggs that may rot and explode in the incubator. It is done by observing the eggs with a bright light in a dark room.
On day 15, also known as lockdown day, you should stop turning the eggs and let them rest before hatching begins. If using an automatic egg turner, turn it off and remove the eggs. If your incubator has removable racks, gently place the eggs flat on the bottom of the incubator.
To ensure a successful incubation period, it is crucial to maintain a stable temperature and humidity in the incubator. The ideal temperature is 37.5°C or 99.5°F throughout the entire incubation process. Additionally, it is recommended to use backup thermometer-hygrometers to accurately monitor the temperature and humidity levels.
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Frequently asked questions
Using a phone light or a flashlight in a dark room is a good way to candle quail eggs. Shine the light into the narrow end of the egg from days 7-12 for the best visibility.
Look for the shadow of the chick, which should be visible on the blunt end of the egg. You may also see veins and air bubbles.
It is recommended to candle quail eggs every day to track their progress. However, it is important not to candle during the lockdown period (after day 14) to maintain humidity and allow the chicks to move into the hatching position.
A fertile quail egg can vary in colour when candled. Some people report seeing yellow with red in the centre, while others see emerald green or a combination of blue and yellow.
A bright light is important when candling quail eggs, as it will help you see the veins and embryo more clearly. An iPhone flashlight or iPod/iPhone light is often bright enough.
