Selection of breeding eggs
Generally, the selection of breeding eggs is mainly carried out in two stages. The first time is when the breeding eggs enter the egg bank after collection. The second time is when the eggs are laid before the hatching.
When choosing, there are 3 points:
1.Breeding eggs should come from breeder flocks that are well managed, fed full-price rations, have good production performance, and are healthy in the non-epidemic area. It is best to use the eggs produced by breeders during the peak period of egg production, because at this time Breeders have high genetic quality, the hatched chicks are easy to raise, and their production performance is also high.
2.Try to use breeding eggs with the same or similar storage period to facilitate the synchronization of embryonic egg development, and to facilitate hatching production and brooding management.
3.Select the normal egg shape index (longitudinal diameter/transverse diameter) (the egg shape index of each species has a certain range), the egg weight and egg shell color conform to the characteristics of the species, the egg shell structure is fine and uniform, the thickness is appropriate, and the surface is clean and without The broken eggs are reserved as breeding eggs.
storage of breeding eggs
After the breeding eggs have been collected, counted, disinfected, etc., they should be placed in a dedicated egg store for storage in time. At the same time, it is also necessary to ensure that the egg trays and egg racks that are in contact with the breeding eggs are clean and hygienic. The egg trays must have gaps, and the breeding eggs should not be packed in airtight boxes, and the air will not circulate. Otherwise, the embryo eggs will be caused by lack of oxygen. Death by asphyxiation.
The storage time of breeding eggs should be as short as possible, no more than 7 days. When the storage time is more than 15 days, the hatching rate drops significantly, and the quality of the hatched chicks is also obviously poor. When the storage time exceeds 3 weeks, the hatching rate will drop sharply. If the time is more than 1 month, It may cause most of the eggs to lose vitality and cannot be used for hatching.
The storage temperature varies with the storage time. If the storage period is less than 7 days, the temperature should be 13～17℃. When it exceeds 7 days, the temperature should be 10-12℃. At the same time, the storage degree is required to be relatively constant, and not to fluctuate.
Breeding eggs should be stored in an environment with a relative humidity of 70% to 80%. If the relative humidity is too low, the moisture in the embryonic egg will be lost through the small holes on the surface of the eggshell, resulting in dehydration of the embryo. If the humidity is too high, it will cause the growth of mold on the surface of the eggshell.
When storing breeding eggs, under the premise of ensuring a certain temperature and humidity, ventilation and environmental sanitation should also be done.
4.Turn the eggs regularly
During the storage period of the breeding eggs, if they are placed in an improper position or left unmoved for a long time, adhesion of the yolk, blastoderm and egg shell will occur, leading to early embryonic death. In order to prevent this from happening, place the blunt end of the egg downward. This will not only make the yolk be located in the center of the egg, but also extend the storage time. The egg should be turned once a day to prevent embryo adhesion.
In addition to the above content, there is one more thing to note: the gelatinous layer on the eggshell surface of the eggs that have been soaked or cleaned in the solution has been destroyed. Descent. The storage time of soaked eggs must not be too long, usually limited to 2 days
transportation of breeding eggs
Vehicles for transporting breeding eggs must be dedicated vehicles. Transport vehicles must also be spray disinfected before the hatchery, before loading eggs in the breeding farm, and before unloading the hatchery. In the choice of boxes, it is best to use special egg boxes. When the eggs are packed, unqualified eggs should be eliminated. The outside of the egg box should be marked with words or marks such as “breeding eggs”, “handle with care”, “do not press hard” or “fragile”. When loading and placing the carton, the number of layers of egg boxes should not be too many, which can be determined by factors such as the solidity of the box body and road conditions. When transporting, it is required to be fast and stable to avoid bumps and shocks. The temperature during transportation should be determined according to the length of time from the production of the seed protein to the incubation period, which is usually 12-18°C and the humidity is 70%. If you are transporting in winter, you must do a good job of preventing cold during transportation; during summer, you must avoid the sun, rain and high temperature. The transportation time cannot be too long, the shorter the better. After the eggs arrive at the destination, when the transport vehicle is unloaded after disinfection, the operator is required to wash his hands, disinfect and wear special clothing before moving the eggs, and pay attention to handling them gently. After unloading the truck, open the box for inspection in time, pick out the damaged eggs, count the number, disinfect, and enter the incubator.disinfection of breeding eggsGenerally speaking, breeding eggs need to be disinfected twice:
the first time,
After being collected in the chicken house or sports field, it is disinfected for the first time in the disinfection cabinet or disinfection room, and then placed in the storage room for storage.
At this stage, disinfection is required to be timely. Otherwise, after some pathogenic microorganisms enter the egg through the stomata, the effect will be reduced or even invalid.
the second time,
Since the sterilized eggs may be contaminated again after storage and transportation, they must be sterilized once before the formal incubation.
Methods of disinfection of breeding eggs:
① Formalin fumigation.
Here, it is required that a relatively sealed environmental space must be set up during disinfection to ensure the effective concentration of the drug in the environmental space. Therefore, a well-sealed disinfection cabinet can be made for disinfection, or the breeding eggs can be placed in an incubator for disinfection.
This method is mainly used for disinfection of breeding eggs before hatching.
② Peracetic acid fumigation.
When using this method for disinfection, you need to pay attention: it is ready to use and stored under low temperature conditions; peracetic acid is highly corrosive, so pay attention to safety when using it.
Generally speaking, it is not advisable to clean the breeding eggs.
There is a layer of rubber protective film on the surface of the eggshell, which plays a certain role in defending against the invasion of pathogenic microorganisms and maintaining its hardness. For lightly contaminated breeding eggs, they can be disinfected after wiping with a brush or dry cloth. If the surface of the eggshell is heavily contaminated and contaminated with a large amount of feces and other debris, it needs to be cleaned properly. The cleaning and disinfection can be combined at the same time, that is, a certain dose of disinfectant is added to the cleaning solution.
When disinfecting and cleaning the breeding eggs, you also need to pay attention to the following 3 points:
① When the breeding eggs are cleaned with a cleaning solution or disinfected with a disinfectant, the temperature of the cleaning solution or disinfectant must be slightly higher than the egg temperature, usually around 40°C.
If the temperature is lower than the egg temperature, the contents of the egg will shrink when cold, causing negative pressure in the egg, and harmful substances on the surface of the eggshell (including pathogenic microorganisms on the surface of the eggshell) will be sucked into the egg through the eggshell. , Causing the breeding eggs to be contaminated. However, putting the cooler eggs in the cleaning solution or disinfecting solution at 40℃ will lower the temperature of the cleaning solution or disinfecting solution.
Therefore, in order to maintain a suitable temperature, it is necessary to appropriately add a certain amount of cleaning solution or disinfectant with a slightly higher temperature in the intermediate process.
②After solution soaking or cleaning, the plastic film on the surface of the egg shell has been destroyed, pathogenic microorganisms may enter the egg, affect the quality of the embryo egg, and reduce its vitality. So solution immersion or spray disinfection and cleaning can only be done It is used before the eggs are hatched, and it is also required that the preservation time of the soaked eggs must not be too long, usually not more than 2 days.
③Because the breeding egg is also a living organism, it has a certain tolerance limit to various disinfection methods, and when the limit is exceeded, it will have an adverse effect on it. Therefore, the disinfection is not the more times, the longer the time, or the higher the concentration of the drug, the better. The number of disinfection, the disinfection time and the concentration of the liquid should be strictly controlled.
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