First, there is no increase in sperm. Due to the difference in breeds of geese, the average fertilization rate of goose eggs is 75-85%. If there is no more than 15-25% of eggs, it is an abnormal phenomenon. The main reasons for the formation are: the proportion of male and female geese is not coordinated, too many or too few male geese, old geese, obesity, stomping, lack of pools for mating, inadequate supply of green fodder during breeding season, and lack of nutrition. These factors affect the normal mating of geese and reduce sperm motility. In order to increase the fertilization rate of breeding eggs, it is necessary to strictly select breeding geese to eliminate and eliminate a small number of individuals with poor development, weak physique, and weak ability to breed. According to the ratio of male to female of 1:5-1:6, leave the male goose. To provide a suitable water surface for breeding geese, feed geese before breeding eggs to ensure nutritional needs. The value of attention is the very low fertilization rate of the first-produced eggs, and generally do not breed eggs.
Second, more dead embryos. Within 7-25 days after hatching, the number of dead embryos increased. This is because of lack of nutrition in the breeding geese, which affects the normal development of the embryos in the eggs. Inappropriate hatching and temperature causes the embryonic development to be hindered. To this end, it is necessary to strengthen the rearing and management of goslings during the laying period, and it should be based on feeding, supplemented by grazing, and the rations for feeding should fully consider the nutrients required by the laying geese for egg production and provide reasonable cooperation. Constantly updating geese and reducing inbreeding. Adjust the appropriate incubation temperature, while checking the accuracy of the thermometer and the placement, to prevent human judgment errors.
Third, the egg yolk adhesion shell. This is due to improper preservation of eggs. At higher or lower ambient temperatures, future development of the embryo will be affected. The suitable temperature for egg preservation is 13-16°C. In order to reduce the evaporation of water in the egg, the humidity must be increased, and it is generally preferable to keep it at 75-85%. Under normal circumstances, the preservation time of eggs can not be too long, 7 days is appropriate, not more than 2 weeks. In addition, eggs must be turned during storage, eggs need not be turned over for one week, and eggs should be turned 1-2 times per day for more than one week. Just change the placement angle of the egg when turning the egg.
Fourth, goslings can not hatch. It is common for eggshells to break and the embryos develop well. Goslings can't shell out. This is due to the low ambient humidity and poor ventilation during shelling. This requires that in the last two days of the post-hatching period, the humidity should be maintained at 70-80%, while increasing ventilation.
5. The rancid odor occurs during the incubation of the eggs. Mostly because the eggs were contaminated. It is necessary to do a good job in the environmental hygiene of breeding geese and keep goose sheds clean to prevent contamination of eggs. Dirty eggs cannot be directly hatched and the eggs must be sterilized. There are two commonly used disinfection methods: First, formalin fumigation. Put the eggs in the egg tray and cover the shelves with plastic film. Place ceramic or glass containers. Add a small amount of warm water, then add potassium permanganate, then add formalin. The dosage is 14 ml of formalin and 7 g of potassium permanganate per cubic meter of space, and it is fumigated for half an hour. The second is the benzalkonium immersion disinfection method. The 1:10 (5% stock solution + 50 times water) benzalkonium bromide solution was warmed to 40-45°C and the eggs were placed in the solution in a water bath for 30 minutes.
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