Egg hatching conditions and methods

Temperature is the most important factor in the development of goose embryos. During the incubation process, embryo development is very sensitive to changes in temperature, and the appropriate incubation temperature is the guarantee for the normal growth and development of goose embryos. Correct control and use of incubation temperature is the primary condition for improving hatching rate. In the incubation process, the temperature standard is affected by many factors and should be used flexibly within the temperature range: the temperature of the small goose species should be slightly lower than that of the medium and large goose species; in the summer, when the room temperature is higher, the incubation temperature should be lower than the winter temperature. Spring season and so on. The total incubation temperature during incubation is required to be high before and after, and to prevent over-temperature in the middle and late stages of incubation. Stereo-incubators often use the following two types of thermal solutions.

(I) Incubation at constant temperature (in batches)

Applicable to the hatching method used when the egg source is insufficient. Usually, there are 3 to 4 batches of eggs in the incubator, which make full use of the metabolic heat of the embryos as a heat source to meet the temperature requirements of eggs of different embryonic ages. When the temperature is incubated, new and old eggs are staggered. The general air temperature is controlled at 37°C.

(b) Variable temperature hatching (whole batch hatching)

Suitable for the hatching method used when the egg source is sufficient. (1) Temperature on the first day of incubation is 39°C to 39.5°C; (2) Day 2 of 38.5°C to 39°C; (3) Day 3 of 38°C to 38.5°C; (4) Day 4 to 21 of 37.8°C (5) After 22 days, it will be transferred into a bed and hatched.

Second, the humidity

1. The requirements for humidity are different at different stages of incubation. The principle of humidity control is “two high and middle low”.

2. 50% to 55% on the 10th to 26th days;

3, 27 to 31 days for the normal gosling out of the shell, to prevent adhesion of villi and shell membrane, the appropriate relative humidity of 65 to 70%.

If batch hatching is used, there are embryonic eggs of different embryonic ages in the incubator. The relative humidity should be controlled at 50 to 60%, and increased to 65 to 70% during hatching.

Third, ventilation

1. During embryonic development, the embryo exchanges gas, absorbs oxygen, and releases carbon dioxide. During the incubation process, it can be ventilated and ventilated. It can continuously provide the oxygen needed by the embryo, discharge carbon dioxide in time, and can evenly heat the internal temperature, dissipate residual heat, etc. effect.

2, if the whole batch of hatching, in the early hatching can not open or less open vents, with the increase in embryonic age. Then gradually increase or fully open the vent hole. Ventilation is closely related to the control of temperature and humidity. Poor ventilation, non-flow of air, increased humidity, uneven temperature, excessive ventilation, and difficulty in maintaining temperature and humidity. Therefore, the ventilation and ventilation volume should be properly adjusted.

Fourth, turn the egg

1. During hatching, regular egg turning can make the embryonated eggs evenly heated, prevent embryos from adhering to the shell membrane, facilitate embryonic development, promote embryonic movement, maintain normal fetal position, and facilitate hatching.

2. The angle of turning the eggs in the machine is better to reach 90°C, turning the eggs every 2 hours.

3. The traditional hatching method such as flat hatching does not have an egg transfer device. Because the eggs are laid flat, the egg can be manually turned and the turning angle is 180 degrees. At the same time, the position of the egg sieve should be adjusted. The eggs can be turned 6 to 8 times a day, at least. Should reach 4 times.

Fifth, cool eggs

In the later stages of incubation, cool egg measures must be taken to help the embryo cool down in time. Usually cool eggs 2 times a day, every 30 to 40 minutes, ranging from 15 to 20 minutes, when the egg is cooled, the egg tray is turned out of the machine, each time the cool egg no more than 40 minutes. Egg temperature is not easy to drop during cool eggs in summer, and cold water can be sprayed on the egg surface to achieve the purpose of quickly cooling eggs. When the egg cools to a warm tone with the eye, it can be placed in the machine.

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