Ben Carter
Candling is a technique used to assess the development of quail eggs. It involves using a light source to illuminate the eggs, allowing for the visualization of the embryo and veining. While it can be challenging for beginners, using a phone with a decent light source can help. This method aids in tracking the progress of egg development and determining fertility. It's important to candle in a dark room and maintain clean, dry hands to avoid damaging the eggs. Additionally, comparing eggs within the same batch can provide a reference for typical characteristics.
| Characteristics | Values |
|---|---|
| Quail eggs candling difficulty level | Very difficult |
| Best light source for candling | Phone light, iPod/iPhone light, flashlight |
| Ideal environment for candling | Dark room |
| Pre-candling precautions | Clean, dry hands; quick and gentle handling |
| Post-candling precautions | Prevent eggs from getting cold or overheated |
| Embryo visibility | Not visible in most or any eggs |
| Comparison | Compare eggs to others in the same batch |
| Discarding | Wait a few days before discarding eggs unless they smell bad |
| Humidity | Raise humidity on day 15 |
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What You'll Learn
Candling quail eggs with a phone light
Candling quail eggs can be a daunting task, especially for beginners. Here is a detailed guide on how to candle quail eggs using your phone light:
Prepare the Environment:
Start by creating the right environment for candling. Choose a dark room to enhance the visibility of the light source. Ensure that your hands are clean and dry to avoid leaving marks or transferring germs to the eggs.
Choose the Right Moment:
The angle of candling is crucial. Avoid candling every day, as it may harm the embryo. The best days to candle quail eggs are days 9 and 15. Day 9 is ideal for checking infertility, while day 15 is crucial for identifying any eggs that might not hatch.
Use Your Phone Light:
Shine your phone's flashlight onto the fat side of the egg. IPhone lights tend to work well for this purpose. The angle of candling should expose the most visible detail at a given day of development, which is typically not the wide end of the egg, especially in later incubation stages.
Observe and Compare:
Look for shadows, veins, or embryos within the egg. Keep in mind that it is normal not to see veins or embryos in most or even any of the eggs, especially if you are a beginner. Compare your observations with other eggs in the same batch. If you are unsure about an egg's viability, wait a few days before discarding it, unless it shows signs of rotting.
Additional Tips:
If you need to visualise something more clearly, use a flashlight for a stronger light source. Maintain the eggs' temperature during candling, ensuring they don't get too cold or overheated.
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Humidity and egg development
Humidity is a crucial factor in the successful incubation and hatching of quail eggs. It regulates moisture loss from the eggshell over time, creating the air cell the chick will breathe from during hatching. If humidity levels are too high, the chick could drown, and if they're too low, the inner membrane dries out, making it hard for the chick to hatch.
The recommended humidity levels vary depending on the source. Some sources suggest maintaining a relative humidity of 45–50% for the first 14 days, then increasing it to 65–70% for the final three days before hatching. This allows embryos time to develop properly and prepares them for a safe hatch. Others suggest a lower humidity of 20–25% during incubation, increasing to 75% or more for hatching.
It's important to monitor the air cells to determine if adjustments to humidity are needed. One source recommends starting with 45% humidity, which is typically recommended for quail eggs, and adjusting as needed based on the eggs' progress.
Maintaining stable humidity levels can be challenging, especially when using an incubator. It's recommended to use a separate digital thermometer and hygrometer placed at egg level to get accurate, real-time feedback on temperature and humidity levels. Running the incubator for at least 24 hours before setting the eggs allows for adjustments to be made beforehand.
Some incubators have automatic humidity regulation, which can be helpful for those who are unable to manually adjust settings throughout the day. However, these incubators tend to be more expensive.
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What to do if eggs don't hatch
Quail eggs are notoriously difficult to candle, especially for beginners. If you're having trouble seeing inside the shell, even with a bright light, don't worry—you're not alone. It's normal not to see veining or embryos in most or any of your eggs, and you shouldn't panic.
However, if your eggs don't hatch, there are several possible reasons. Firstly, it's important to ensure you're following the correct procedures for hatching quail eggs. This includes maintaining the right temperature and humidity levels, as smaller eggs like quail eggs are more sensitive to temperature spikes and swings. High humidity at the time of hatching can cause the chick to run out of oxygen, while low humidity can cause the membrane to dry out and shrinkwrap the chick, preventing it from rotating to unzip the egg. Additionally, opening the hatcher too often can reduce the temperature and humidity, causing various issues.
The age of the eggs is another critical factor. Eggs that are too old may not develop, and older eggs are also more prone to contamination by mould or bacteria, which can cause the egg to darken, stink, and seep liquid. Furthermore, eggs that have been in transit for too long may become too old to develop. It's recommended to purchase eggs from reputable farms and breeders to avoid issues with fertility in shipped eggs.
Incubation temperature can also be a factor. If the temperature is too high when the eggs are first placed in the incubator, it may kill the embryos before any signs of development are visible. Temperatures above 104 degrees Fahrenheit can be fatal to embryos. On the other hand, low incubation temperatures can also be detrimental.
Other potential causes include nutritional deficiencies, disease, genetic problems, improper husbandry practices, and physical trauma during shipping, such as vibration or temperature fluctuations.
If your eggs don't hatch, it's essential to remain patient and not immediately discard them. Give them some more time, and if they start to stink or show signs of contamination, then you can dispose of them.
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How to identify a fertile egg
To identify a fertile quail egg, there are two simple methods: candling and spotting the bullseye.
Candling involves checking the fertility of an egg by holding it up to a bright light in a dark room. If there is a dark spot, the egg is fertile. However, this method can be challenging with fresh eggs, which are less than three days old. In this case, you must use an incubator and allow at least three days of incubation before candling. Even then, it can be difficult to see anything developing in the egg until days 5-7.
Alternatively, you can crack open the egg and look for a bullseye pattern. A ring around a tiny dot indicates fertility, while the absence of a ring suggests infertility. However, this method sacrifices the egg and is not ideal if you plan to hatch it.
It is important to handle quail eggs carefully, especially within the first four days, as the tiny blood vessels inside are easily damaged. In addition, the orientation of stored eggs matters. The round end should be facing upwards, not the pointy end, due to the location of the air sack and how bird embryos develop. Rough handling or incorrect orientation can cause embryonic failure.
By using these methods, you can identify fertile quail eggs and improve your hatch success rates.
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Using a candler vs. a phone light
Quail eggs are notoriously difficult to candle, especially for beginners who may not have access to a good candler. However, most people have a phone with a decent light source, making it a convenient option for candling.
Using a phone light for candling quail eggs has its advantages. It is easily accessible, and one can quickly check on the development of the eggs without having to invest in a separate candler. Additionally, it can be reassuring for beginners to compare their phone-candled quail eggs to pictures of normally developing eggs. This can help them understand what is typical and expected, rather than being disappointed by not seeing veining or embryos, which may require a better candler and more experience to detect.
However, there are limitations to using a phone light for candling. The camera on a phone may not capture the true image of the developing embryo, leading to confusion or concern. The pictures taken by a phone camera may not accurately represent what the human eye perceives, which can be misleading for those new to candling. Furthermore, phone lights may not be bright enough to show any veins or embryos, especially if the egg shells are too dark.
On the other hand, a dedicated egg candler provides a bright and focused beam of light, making it easier to observe the development of the embryo. The FRD-10 egg candler, for example, uses a reliable LED light, eliminating the need to replace light bulbs. It also comes with different-sized light focus beams to accommodate various egg sizes, including small quail eggs. Candling with a dedicated device allows for early detection of fertility issues, helping to plan for the number of chicks that will hatch and removing the risk of rotten eggs in the incubator.
In conclusion, while a phone light is a convenient and accessible option for candling quail eggs, it may not provide the brightness or accuracy needed for effective candling, especially for darker-shelled eggs. For those planning to hatch eggs regularly, investing in a proper candler is recommended for better lighting, less light leakage, and the ability to detect fertility issues early on.
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