The simpl method of incubating egg in history

Take a paper box, spread it with half an inch of cotton, put the eggs in the box, cover the box tightly with a quilt, and keep the temperature in the box at 38-39 degrees. It is best to turn the eggs carefully every 6-8 hours. 1-2 days later, the chicken will be born.

1. Choose cartons (or wooden cases) according to the number of hatched eggs.

2. Spread half an inch thick cotton on the bottom of the box.

3. Put the selected eggs in the box, generally not more than three layers, otherwise it will affect the hatching effect.

4. Put the thermometer on the egg to measure the temperature.

5. Cover the box tightly with a quilt to keep the temperature in the box at 38-39 degrees and keep the eggs in a warm environment.

6. It is best to turn the eggs carefully every 6-8 hours to keep the temperature uniform.

7, hatch to 19 days, put the egg head up. Pay attention to handle with care.

8. Eggs are cooled every 3 hours or so, each time 1-2 minutes.

9. Wait patiently. 1-2 days later, the chicken will be born.

Factors affecting hatching

During the development of chicken embryos, gas exchange must be carried out, especially after 19 days of incubation (12 hours in advance in summer), the embryos began to breathe in the lungs, and the oxygen demand gradually increased, and the amount of carbon dioxide discharged gradually increased.

At this time, if there is poor ventilation, it will cause serious hypoxia in the incubator. Even if the respiration of hatched chicks is increased by 2-3 times, it still can't meet their oxygen demand. It leads to the inhibition of the intermediate metabolism of cells, the accumulation of acidic substances in the body, the increase of the partial pressure of carbon dioxide in the tissue, and metabolic respiratory acidosis, which leads to the decrease of cardiac output, myocardial hypoxia, necrosis, heartbeat disorder and cardiac arrest.

It was determined that the oxygen consumption of each embryo egg during the whole incubation period was 4-4.5L, and the discharged carbon dioxide was 3-3.5L. Experiments proved that when the oxygen content in the incubator decreased by 65438 0%, the hatching rate decreased by 5%. The content of carbon dioxide around the embryo egg should not exceed 0.5%. When the carbon dioxide reaches 65438 0%, the embryo development will be delayed, the mortality rate will increase and the deformity will increase. Generally, the normal oxygen content in air can be maintained at 20%-2 1%. Therefore, the key to ventilation is to minimize the concentration of carbon dioxide around embryonic eggs.