Jessie Taylor
Duck eggs are a little trickier to hatch than chicken eggs, and the correct humidity levels are much more important for waterfowl. Ducklings require a slightly higher humidity level during the hatching process than chickens, and if there isn't enough humidity, they can become shrink-wrapped and perish. When using an incubator, it's important to candle duck eggs to check for embryo development and remove any eggs that are infertile or showing signs of bacteria. So, when is the best time to candle duck eggs in an incubator? Some sources suggest candling at day 4 or 5, while others recommend day 7, day 10, or even every day of incubation. It's also a good idea to candle eggs before setting them in the incubator to check for cracks, and again at the end of the incubation period if some eggs are slow to hatch.
| Characteristics | Values |
|---|---|
| When to candle duck eggs | Day 4 or 5, Day 7, Day 10, Day 14, Day 21, Day 25 |
| How often to candle duck eggs | Several times throughout incubation |
| What to look for when candling | Embryo development, hairline cracks, blood ring |
| How to candle | Shine a direct beam of light through the eggshell |
| Tools for candling | Candle, flashlight, egg candlers |
| Incubator setup | Set up at least 24 hours before, place in a constant-temperature room, away from windows and direct sunlight |
| Incubator temperature | 99.5°F for the entire 28-day period |
| Incubator humidity | 55% (84.5°F on wet bulb thermometer), increase to 75%+ towards the end |
| Egg turning | By hand at least once every 8 hours, or use an automatic turner |
| Egg weight loss | Common duck eggs should lose about 14% of their weight by day 25 |
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What You'll Learn
Duck eggs require a higher humidity level than chicken eggs
Duck eggs typically require 28 days to hatch, which is slightly longer than chicken eggs. During this time, the duckling grows inside the egg, and there is a loss of water from the egg, along with an increase in the size of the air cell. Ducklings require a higher humidity level during the hatching process than chicken eggs. This is because ducklings can become ""shrink-wrapped" if the humidity is too low; the shell membranes dry up and contract around the duckling, restricting its movement and often leading to its death.
The ideal humidity levels for duck eggs are 55-65% for the first 24 days, and then 65-75% from day 25 until the first pipping, which usually occurs around day 28. When pipping starts, the humidity should be increased to 80-85%. Ventilation is also important to provide oxygen to the embryos and prevent high humidity.
In comparison, chicken eggs need 50-55% humidity for days 1-18 and 65-75% for days 19-21. Chicken eggs can be "locked down" during the last three days of incubation, where the humidity is increased to help the chicks break out.
It is important to note that the incubator setup is crucial for successful duck egg hatching. The incubator should be set up at least 24 hours beforehand to allow temperature and humidity levels to stabilise. The incubator should be placed in a room with a constant temperature, free from drafts, and away from direct sunlight.
Candling is a process where a special lamp is used to peer through the shell of the egg to check the embryo's development and the size of the air sac. For duck eggs, candling is typically done around day 10 to check for a developing embryo, which will appear as a tiny "spider" with veins radiating from a dark spot. Additional candling can be done halfway through the incubation period to ensure the embryo continues to develop. On day 26, the eggs should no longer be turned by hand, as the ducklings are nearly fully developed and will position themselves inside the egg for hatching.
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Ideal incubator temperature is 99.5°F
To create the ideal environment for duck eggs to hatch, it is important to set up your incubator at least 24 hours beforehand. This allows the temperature and humidity levels to stabilise, giving your duck eggs the best chance of hatching. The ideal incubator temperature is 99.5°F (37.5°C) for the entire 28-day incubation and hatching period.
It is crucial to place your incubator in a room that maintains a constant temperature, is free from drafts, and is away from windows and direct sunlight. Additionally, ensure that children and pets cannot bump into or disturb the incubator.
The relative humidity should be set at 55% (84.5°F on a wet-bulb thermometer) for the first 25 days of incubation. Then, as the ducklings prepare to hatch, the humidity should be increased to 65-70% (88-90°F on a wet-bulb thermometer). This higher humidity is crucial for waterfowl like ducks, as without it, ducklings can become "shrink-wrapped" when the shell membranes dry up and constrict their movement.
During the first 25 days of incubation, you will need to hand-turn the eggs at least once every eight hours if you are not using an automatic turner. Many people report better hatch rates when turning the eggs by hand. On day 25, stop turning the eggs and increase the humidity to around 80% to help the duckling break out of the shell.
On day seven of incubation, you can candle the eggs to check for any abnormalities. This involves shining a bright light through the egg to inspect for proper development. Any eggs that appear clear with no developing embryo should be removed from the incubator.
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Candling checks for embryo development
Candling is a process that involves examining the interior of an egg with a bright light to check for embryo development and detect issues early. It gets its name from the fact that, traditionally, a candle was used as the light source.
The embryo appears as a tiny "spider" with veins radiating from a dark spot. If the egg appears clear, it is likely infertile and can be discarded. Other signs to look out for include hairline cracks, which can cause the egg to become contaminated and not hatch, and a blood ring, which indicates bacterial contamination.
It is recommended to candle duck eggs at various stages of the 28-day incubation period. Some sources suggest candling as early as the first day of incubation, while others recommend waiting until day 4 or 5, by which time the embryo's digestive tract, nervous system, circulatory system, eyes, ears, and brain would have begun to form, and the heart would have started beating. By day 7, spider veining will be visible, and any eggs that appear to have a light round yolk are likely infertile. Day 10 is another important candling day, as it is the time to begin misting and cooling duck eggs. Candling can also be performed at days 14, 21, and 25. On day 25, the ducklings are nearly fully developed and will position themselves inside the egg in preparation for hatching.
It is important to note that care should be taken when candling not to leave the light against the shell for too long. Additionally, if you are hatching eggs under a broody hen or duck, it is crucial to set and candle them all at the same time and then remove any eggs that others lay in the nest after the incubation period has started.
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Ducklings absorb the yolk before hatching
Duck eggs typically take 28 days to hatch. During this time, the duckling develops inside the egg, and there is a loss of water from the egg, along with an increase in the size of the air cell. The air cell should occupy about one-third of the space inside the egg at 25 days of incubation for common ducks. At this stage, the duckling is still inside the egg and is preparing to hatch.
The internal pip is the first step in hatching, when the duckling breaks into the air cell. This is followed by the external pip, which occurs approximately 12-24 hours later, when the duckling creates a small, star-shaped crack or hole on the outside of the shell. After the external pip, the duckling remains inside the egg for several hours to absorb the yolk sac and blood vessels. This is a crucial period for the duckling, as it learns to breathe and absorbs the nutrients it needs from the yolk sac.
The yolk sac is a vital source of nutrition for the duckling and is usually absorbed into the abdomen before hatching. However, in some cases, a duckling may hatch with an unabsorbed yolk, where the yolk sac remains visible and has not been fully taken into the body. This condition can lead to health complications, such as malnutrition and infection, and may affect the duckling's growth and development. Symptoms of an unabsorbed yolk include swelling or protrusion in the abdominal area, lethargy, reduced activity, and responsiveness compared to other ducklings.
To ensure optimal hatching conditions and prevent issues like unabsorbed yolk, it is essential to maintain the correct temperature and humidity levels in the incubator. The incubator should be set up at least 24 hours before setting the duck eggs to allow the temperature and humidity levels to stabilize. The temperature should be maintained at 99.5°F (37.5°C) for the entire incubation period, and the relative humidity should be set at 55% (84.5°F on a wet bulb thermometer). Additionally, it is recommended to candle the eggs at around day 10 of incubation to check for embryo development and remove any infertile or unhealthy eggs.
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Candling can be done with a flashlight or a candle
Candling is a process that involves shining a direct beam of light through a developing egg's shell to check for signs of an embryo. The process gets its name from the traditional practice of using a candle to provide the light. Candling can also be used to check for hairline cracks in the egg, which could cause contamination and prevent the egg from hatching.
Candling duck eggs can be done with a flashlight or a candle, as well as with a specialised egg candler. If you are on a budget, you can even make your own egg candler by placing a desk lamp with a bright, low-energy lightbulb inside a cardboard box. Cut a small, round hole in the top of the box, just big enough for the pointed end of an egg. Modern LED torches that don't give off much heat are also a good option for candling eggs.
When candling duck eggs, it is important to check for clear, distinct veins, which indicate that the embryo is alive. By day 12, you may be able to see movement if you hold the egg still during candling. By day 22, the embryo fills so much of the egg that you may only see around the air sac. If you candle on day 26 or 27, you may even see the bill of the duck moving inside the air sac.
It is recommended to candle duck eggs after 7 days of incubation and again at 14 days. After a week of incubation, you can be reasonably certain about the viability of the embryo. At 14 days, you can remove any eggs with embryos that have died to reduce the risk of a rotten egg exploding. After 14 days, candling is not recommended as the duckling moves into position to hatch and there is not much room left in the egg to see anything.
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Frequently asked questions
Candling refers to shining a direct beam of light through the eggshell to look for signs of a growing embryo.
Duck eggs should be candled before placing them in the incubator to check for cracks. During the incubation period, they can be candled several times to ensure the embryos are developing. Some sources recommend candling at 7 days, 10 days, 14 days, 21 days, and 25 days.
At around 7 days, you should be able to see embryo development. The embryo should appear as a tiny "spider" with veins radiating from a dark spot. Any eggs that appear clear or cloudy should be removed from the incubator.
Duck eggs should be turned at least four times a day, and some sources recommend turning them at least every hour. This prevents the embryo from sticking to the membrane and shell.
Ducklings require a slightly higher humidity level than chickens during the hatching process. The temperature should be set at 99.5 °F for the entire incubation period, and the relative humidity should be set at 55% (84.5 °F on a wet bulb thermometer).
