Converting a broken or old one refrigerator into a full-fledged incubator is a popular solution among farmers and poultry farming enthusiasts who want to save on expensive industrial equipment. The body of the refrigerator compartment has excellent thermal insulation, which allows you to maintain a stable microclimate necessary for the embryonic development of the bird.
The process of laying eggs in such a homemade system requires strict adherence to the temperature regime and the rules for placing trays. Unlike factory models, here you will have to independently control air circulation and heat distribution to avoid overheating or underheating of the masonry.
The success of hatching chicks directly depends on the correct preparation of the chamber and proper placement of biological material. Even the slightest mistakes at the laying stage can lead to the death of embryos or the appearance of non-viable young animals, so the procedure must be approached with maximum responsibility.
Preparing the refrigerator for work
The first stage is thorough cleaning and disinfection of the internal chamber. It is necessary to remove all foreign odors that can negatively affect the development of embryos, and treat the surfaces with antiseptic solutions.
It is important to check the integrity of the rubber seals on the door. Tightness chambers are a key factor in retaining heat and humidity. If the rubber is cracked or has lost its elasticity, it must be replaced or restored using special means.
The next step is to install a heating and ventilation system. Most often, incandescent lamps or special heating elements located in the upper part of the chamber are used. Uniform distribution of heat is ensured by the operation of fans that create forced circulation air.
⚠️ Attention: Never use heating elements with an open spiral inside the chamber, as this can cause a fire or dry out the air to critical values.
Selection and preparation of eggs for incubation
The quality of the future offspring is laid down long before the eggs are placed in the incubator. Only fresh eggs obtained from healthy birds kept in proper feeding conditions are suitable for laying.
The optimal shelf life of the material before laying should not exceed 5-7 days. The longer the egg sits, the lower the hatch rate. Before placing them in the chamber, they must be carefully cleaned of dirt with a dry soft cloth.
Washing eggs are strictly prohibited before laying, since water washes away the protective cuticle, opening the pores for the penetration of pathogenic bacteria. If the shells are heavily soiled, you can lightly wipe them with a weak solution of potassium permanganate, but it is better to avoid contact with moisture.
An important parameter is the shape and size. For incubation, eggs of medium size, characteristic of this type of bird, are selected. Too small or, conversely, gigantic specimens often produce weak offspring or have developmental defects.
The layout of trays in the chamber
The correct placement of trays in a converted refrigerator determines the uniform heating of the entire masonry. Trays should be installed at different heights or use rotating mechanisms if the design allows their implementation.
The distance between the trays should ensure free passage of air. If you use a too dense arrangement, a stagnation zone may form in the center of the nest, where the temperature will be significantly lower than the required one.
☑️ Check before laying
For ease of maintenance and turning the eggs, it is recommended to fix the trays on movable frames or use manual tilting mechanisms. This allows you to turn the entire clutch at the same time without opening the incubator door for a long time.
| Bird type | Temperature (°C) | Humidity (%) | Incubation period (days) |
|---|---|---|---|
| Chickens | 37.8 | 50-60 | 21 |
| Ducks | 37.6 | 55-65 | 28 |
| Geese | 37.8 | 60-70 | 30 |
| Turkeys | 37.6 | 55-60 | 28 |
Setting the temperature
Maintaining a stable temperature is the most difficult task in a homemade incubator. Unlike factory models with electronics, in a refrigerator from a refrigerator control is often carried out by mechanical thermostats or homemade circuits.
The temperature gradient inside the chamber should be minimal. The temperature difference in different corners of the tray should not exceed 0.2-0.3 degrees. To check, use several thermometers placed at different points.
⚠️ Attention: Overheating by even 0.5 degrees in the first days of incubation can lead to irreversible disturbances in the development of the embryo and mass death of embryos.
What what to do during power surges?
If your network frequently experiences voltage surges, be sure to use a stabilizer or an uninterruptible power supply (UPS). Sudden surges can damage the heating element or, conversely, turn it off, which will lead to cooling of the masonry.
Heating elements should be placed on top, since warm air naturally rises upward. Fans must create a flow that washes the trays from all sides, mixing the air masses.
Humidity and ventilation control
Humidity in the incubator is regulated by the amount of water evaporated. In homemade designs, open baths of water are often used, the surface area of which can be changed by adding or removing floats.
Lack of moisture leads to drying out of the protein and gluing of the embryo to the subshell membrane. Excess moisture makes it difficult for the evaporation of water from the egg, which can lead to the chick drowning at the end of term.
Ventilation plays a dual role: it ensures uniform heating and supplies the developing embryos with oxygen. In the first days, oxygen demand is low, but by the end of incubation it increases many times.
The laying process and the first days
Immediately before laying, the eggs must be warmed to room temperature. A sharp temperature change when placing cold material in a warm incubator will cause condensation on the shell, which is dangerous for the embryo.
It is better to place the egg in the evening so that the first critical hours of development pass in a calm environment, without frequent openings of the door for checks. The incubator door should be opened for the minimum required time.
In the first day, the temperature may fluctuate slightly until the system reaches operating mode. It is important during this period to check the thermometer readings more often and, if necessary, adjust the operation of the heater.
The turning of the eggs begins on the second day. In homemade refrigerator incubators, this is often done by hand. The eggs are turned 180 degrees, changing their position: the blunt end, which was on the left, should be on the right.
⚠️ Attention: In the last three days before hatching (hatching), the turning of the eggs is stopped, and the temperature is slightly reduced, increasing the flow of fresh air.
Common mistakes when laying
One of the common mistakes is laying dirty or washed eggs. Violation of the integrity of the protective layer of the shell opens the way for bacteria, which begin to multiply inside, causing “explosions” of eggs and damage to the entire batch. Incorrect orientation of eggs is also common. The sharp end should always point down, since this is where the air chamber is located, through which the chick takes its first breath. If the position is incorrect, the chick may die, unable to break through the shell.
Incorrect egg orientation is also common. The sharp end should always point down, since this is where the air chamber is located, through which the chick takes its first breath. If the position is incorrect, the chick may die, unable to break through the shell.
Insufficient disinfection chambers before a new laying leads to the accumulation of pathogenic microflora. After each cycle, the incubator must be thoroughly washed and treated with ultraviolet light or steam.
FAQ: Frequently asked questions
Is it possible to lay eggs of different species of birds at the same time?
Technically this is possible if the species require the same temperature and humidity. However, the incubation periods differ for different birds, which will create inconvenience when sampling chicks. It is better to incubate one species at a time.
How often do you need to ventilate the incubator from the refrigerator?
In the first half of the period, it is enough to open the door for 5-10 minutes once a day while turning the eggs. In the second half, when the embryos begin to produce a lot of heat, ventilation is increased up to 2-3 times a day.
What to do if the electricity is turned off?
The refrigerator body holds heat well. When the power goes out, it is necessary to insulate the incubator with blankets or foam. Short-term cooling (up to 2-3 hours) in the middle of incubation is less dangerous than overheating.
Do eggs need to be removed from incubation for ovoscoping?
Yes, ovoscoping should be carried out on days 6-7 and 11-12 to remove “chatterers” (unfertilized or dead eggs). They can burst and infect the entire masonry with infection.