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Hatching chicken eggs takes 21 days from set to hatch. If you decide to make your own, do plenty of research before getting started. The hatch rate in these incubators is generally much lower than in still air or circulated air incubators. DIY incubators are more affordable, but they are much harder to keep a regulated temperature and humidity level. There are many different ways to make your own incubator. The most common still air incubator is the Little Giant Still Air Poultry Incubator. You will need to check the incubator many times each day to ensure that the temperature and humidity levels are staying constant.
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These incubators work, but they require more effort on your part. Other options are heating pads or reptile rocks.A still air incubator does not have a built-in fan so air sits still. If none is available, you might try to use some heat packs like the sportsmen use. Emergency! The incubator broke down and eggs are at risk of dying! It is always best to keep a cheap incubator as a back-up.Slightly lower temperatures will not kill the chick embryos, but can increase incubation times and produce weakened chicks.Do not allow temperatures to exceed these recommendations as temperatures only a degree or two above the recommended temperatures can kill chicks within 15-30 minutes, depending on how high the temperature is and the stage of development of the chick embryo.The same average egg temperature of 100o F can be maintained if the higher temperature of 102 F exists at the egg's uppermost point. Therefore, increasing the temperature at the top of the egg will compensate for the egg's cooler parts. The reason for different temperatures is that circulating air warms all points around the egg shell while still air temperatures are warmer at the top of the egg than at the bottom. The recommended temperature in this type incubator is 102 F. A "still-air" incubator (one without an air circulation system) requires a higher temperature as the temperature in such an incubator is measured using a thermometer with the bulb positioned at the same level as the top of the incubating eggs. If the incubator used has a fan for air circulation, the temperature must be adjusted to 99-100 degrees F. The recommended temperature within an artificial incubator depends on the type of incubator being used. Precise and consistent control of temperature is essential for good hatching results.A good quality egg incubator has a built-in temperature alarm which warns of high or low temperatures. A well-designed incubator should maintain temperature within 1/4 degree F and humidity within 1 degree F wet bulb temperature.(Please refer to the " cooling feature" included with some of the later incubator models.) Temperatures above ideal can quickly have a serious detrimental effect on hatch rates and must be avoided. Developing embryos are fairly tolerant of short term temperature drops and the user need not be concerned about cooling that occurs when inspecting eggs.
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The eggs of almost all domestic bird species can be incubated at the same incubation temperature because of that, eggs of several different bird species can be incubated at the same time within the same incubator.Related Web Resources: Egg Incubation Procedures.