Farm Fresh Potato,Fresh Holland Potatoes,Big Potato Shunwang Agricultural Products Co., Ltd. , http://www.qd-foods.com
Selection, preservation and disinfection of goose eggs
First, the choice of egg breeding eggs quality of hatching rate and the quality of goslings have a great impact. The quality of eggs should be fresh, and the shorter the preservation time, the better. Usually 1 week after childbirth is appropriate, with 3 to 5 days as the best. The size of the eggs should be appropriate, the egg shape is normal, and the eggs that are too long or too round should not be hatched, and too large or too small. The eggshell should be dense and even, the rough surface of the "salvage egg", the hard "steel egg" of the eggshell, and the "drum egg" where the eggshell is uneven and has a raised ring cannot be used for hatching. The shell surface of the egg should be clean, free of cracks and normal in color. In addition, eggs should come from normal, healthy and productive geese. Second, preserved eggs 1 Temperature: Since the fertilized eggs in the egg formation process has begun to develop, the output of the mother outside the body, the embryonic development stopped temporarily, and then began to develop in a certain external environment. When the ambient temperature is high, but as long as this temperature does not reach the proper temperature for embryonic development, the embryonic development is incomplete and unstable and can easily cause early embryonic death. When the ambient temperature is too low for too long (0°C), although the embryonic development may still be at rest, the viability of the embryos declines and they die. The optimum storage temperature is 13°C to 16°C. 2 Humidity: During the preservation of eggs, the moisture in the eggs continuously evaporates through the pores. The speed of the eggs is inversely proportional to the relative humidity in the storage room. In order to minimize the evaporation of moisture in the eggs, the indoor humidity must be increased, and it is generally desirable to keep 75% to 85%. 3 Turning the eggs: During the preservation period, in order to prevent the egg yolk blasts from adhering to the hull membrane and cause early death of embryos, it is necessary to turn the eggs. Within 1 week, it is not necessary to transfer eggs. For more than one week, it is best to transfer eggs one or two times a day. The so-called transfer of eggs, as long as you change the angle of the egg, do not have to fall from the top down. 4 Preservation time: Within 2 weeks after the egg was preserved, the hatching rate decreased by a small margin. If it was kept for more than 2 weeks, the hatching rate decreased significantly. If the egg was kept for more than 3 weeks, the hatching rate dropped sharply. It is advisable to keep the eggs in general within 7 days and do not exceed 2 weeks. If possible, the younger eggs hatch as early as possible. If you keep it for a long time, it will be difficult to obtain the desired results. This is because fresh and non-damaged eggs have bactericidal properties, but after long-term storage, the bactericidal properties will be drastically reduced; after long-term storage, the moisture in the eggs will evaporate, resulting in changes in the pH value of the eggs, causing embryos. The degeneration of the aging and nutrients reduces the vitality of the embryo; it damages the embryo due to the propagation of bacteria on the eggshell surface. When transporting eggs, care should be taken to ensure that they are packaged so that they do not break. Transportation in winter should pay attention to insulation to prevent freezing. III. Sterilization of Eggs 1 Formaldehyde Fumigation: Disinfect in the disinfection room of the hatchery, using 42ml of formalin and 21g of potassium permanganate per cubic meter, at a temperature of 20°C to 24°C and a relative humidity of 75% to 80°C. Under the condition of more than %, fumigation for 20 minutes, the effect is very good, can kill 95% to 98.5% of the pathogen on the eggshell. If disinfected in an incubator, immediately after hatching, use formalin 28ml, potassium permanganate 14g, fumigation for 20 minutes. In China, disinfection is often used during hatching. Formalin 14ml/potassium permanganate 7g/m3 is used for fumigation for half an hour to 1 hour. In the actual operation, it is also possible to cover the egg tray with a plastic film for disinfection. This reduces the size and saves on usage. When fumigation with formaldehyde is used, the following points should be noted. When an egg is fumigated in an incubator, it should avoid embryos of 1 to 4 days of age. Because the above drugs have adverse effects on embryos of 1 to 4 days of embryonic age. 2 The chemical reaction between formalin (40%) and potassium permanganate is severe. Ceramic or glass containers should be used. Add a small amount of warm water, add potassium permanganate, and then add formalin. After 3 eggs are removed from the egg bank or sent to the hatchery disinfection room from the igloo, if the eggshell is covered with water droplets, the fumigation is unfavorable to the embryo and should be avoided. The method is to increase the temperature until the water droplets evaporate. disinfection. 2 Xinjieer sterilization method: spray the solution onto the surface of eggs with a solution of 1:1000 (5% undiluted solution + 50 times water), or soak in the solution at 40°C-45°C for 30 minutes. 3 ultraviolet radiation disinfection method: with ultraviolet light, from the egg height of 40cm at 1 minute irradiation, and then in the back of the egg 1 times.