Egg illumination is to use the light of the egg illuminator to see through the embryo and form an image on the surface of the egg, so as to judge the development of the embryo. Duck eggs need to go through 2~3 times in the whole incubation period, the first time to take the egg is the 6th day, also known as the head photo, the second time to take the egg for 25 days, that is, when the plate is placed, according to the need to be in the duck embryo 13~14 days for sampling. The purpose of the first egg is to remove the infertile eggs and dead embryo eggs, and the second time the purpose of the eggs is to remove the stillborn eggs.
You can use the egg light device, candling table to take the eggs, or you can make your own egg boxes. At present, it is common to use egg lighters for egg lighting. The egg needs a dark environment, the egg tray is taken out of the incubator, placed on the table, and the egg light source is gently stuck on the big head of the egg with the egg light source, and the light source shines from the top to the bottom of the egg, and the embryo development can be judged by comparing the characteristics of embryonic development at each stage. If the candling table is used for egg lighting, the size of the candling table needs to be the same as that of the egg tray, and the egg tray should be placed on the candling table, and the light should shine from the bottom up. Homemade egg boxes can install light bulbs in the carton, and then make a small circular hole in the carton, so that the light can shine through the small hole, and the egg can be seen inside the egg by placing it in the small hole.
In the whole process of taking the egg, the speed should be fast, and the time for the embryo to stay in the external environment should be reduced, so as not to cause the temperature of the embryo to drop too much, affecting the growth and development of the embryo: to prevent shock, causing damage to the embryo: the observation should be accurate, and the embryo egg that is suspected of the egg results should be carefully observed, and try to avoid missing and wrong illumination. If the workload of egg lighting is large, it is necessary to increase the temperature in the room to prevent the temperature of the embryos from dropping too much.
(1) The normal embryonic egg can be seen in the obvious radial vascular network for the first time, forming a waterfall-like distribution along the air chamber downward, and the black eyespot can be seen, and there are 2~3 thicker blood vessels in the center of the egg connected with the black shadow, and the distribution of the vascular network is more than four-fifths of the egg; The second time the egg is illuminated, the air chamber is significantly enlarged, the edge of the air chamber is curved and tilted, which is the so-called oblique mouth, and a black shadow can be seen flashing in the air chamber. The egg body is opaque.
(2) Compared with normal embryos, the blood vessels of the weak embryonic eggs were relatively slender compared with the normal embryonic eggs, the black eyespots were not obvious, and the distribution area of the vascular network was small; The small head part of the weak fetal egg is still shiny, and the edge of the air chamber is not bent or has little curvature.
(3) The infertile egg can be removed by shining the egg for the first time, which is manifested as the air chamber is not obvious, the yolk is pale yellow and shiny, and the blood vessels cannot be seen. When the egg is turned, the flat yolk can be seen floating leisurely and quickly.
(4) The dead embryo egg has blood circles, blood arcs, blood clots, blood spots or broken blood vessel residues after blood diffusion for the first time, the egg color is light white, the egg yolk is emanated, and the air chamber is yellow-brown; The second time the egg was stillborn, the edge of the air chamber was not bent or not bent, the small head was bright, the blood vessels were turbid, there was no fetal movement, and the egg body was cold.