It is important for a poultry owner to know what their embryo looks like at any stage of its development. Each genus of pets has its own distinctive features in the development of the embryo and the formation of the chick, the knowledge of which will help to keep the farm more productive.
Instructions
Step 1
It does not matter to which genus of birds the embryo belongs, the development of any of them has a lot in common. But there are still differences. At certain times of ovoscopy, it is possible to determine with certainty whose chick is developing. But this applies only to poultry and its close wild relatives. Regarding migratory and other birds, there is very little accurate information about the detailed development of the embryo.
Step 2
If a powerful light source is used during transillumination, then a fertilized egg can be distinguished as early as 1-2 days by the presence of a blastodisc. It looks like a large dark spot located in the center of the yolk, but with a slight offset towards the air chamber. In some breeds of chickens, ducks and geese, a light border may be visible on one side of the spot. If the blastodisc is small or barely visible, the chick is likely to be weak or may die.
Step 3
On the 6-7th day, the embryo is clearly distinguishable. The spot brightens, at the same time acquiring a darker outline. The embryo is still immersed in the yolk, but above the place where it is located, a well-distinguishable milky spot is formed - the amnion. At the sharp end of the egg, thin blood vessels (allantois) are clearly visible. The more pronounced they are, the stronger the embryo.
Step 4
On the 10-11th day of its development, the chick looks like a dark spot the size of a yolk, which is penetrated by a dense network of blood vessels filled with blood. Now they are more durable, saturated red. The edges of the allantois by this time completely cover the protein and close at the sharp end of the egg. As it develops, the embryo increases in size and by 19-20 days it occupies 2/3 of its volume. On the 18th day, with the help of a stethoscope, you can hear a clearly distinguishable heartbeat of the chick.
Step 5
What is the difference in the development of the embryos of poultry chicks? By the end of the third week, the development of the chicken embryo is almost complete. A full-fledged chick hatches on days 20-21. The eggs of the turkey poults still need to lie down, these birds are ready to peck the shell only for 27-28 days. Ducklings appear a day earlier, and guinea fowls hatch 24 days after fertilization of the egg.
Step 6
The difference in the appearance and development of the embryos of these birds is as follows: the first down on the back appears in chickens and ducks on day 12, in geese, guinea fowl and turkey poults - on day 14. The chicken is completely covered with down in chickens on day 14, in ducks and turkeys - on 15, in geese and guinea fowls - by 18. Chickens open their eyes at 20 days, goslings - at 28, ducklings - at 26, guinea fowls - at 24, turkeys - at 26. By the appearance of a newborn chick, you can immediately understand which breed of domestic birds it refers to.
