How to draw a hen's mind map

Lesson 14 The drawing method of hen mind map is as follows:

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Hen, a kind of poultry, has a small head, oval eyes, a sharp and hard mouth and long and thick hair, so it is also called round-haired hen. It starts to eat late and slowly. The same chicken, 20.5 days prolific cock, 2 1 day prolific hen.

Classification level: Animal kingdom-Chordata-Vertebrate subfamily-Birds-Thoracodes-Chickens-Pheasants, domestic chickens. When carnivores want to attack and prey on chickens, they will protect them under their wings.

This is an innate behavior: it refers to a genetic feature of this species, which is determined by the genetic material in animals. It doesn't need to learn, and it is born with a behavioral ability. Under appropriate conditions, this ability can be expressed through neuroregulation or hormonal regulation. Simply put, you don't have to learn. Protecting chickens belongs to the innate behavior of hens.

Laying hens enter the expected date of delivery from 16 weeks old and reach the peak of laying eggs at 25 weeks old. During this period, hens not only gained weight, but also changed their physiology greatly. The volume and weight of hen ovary and fallopian tube are closely related to their functions. 1 day-old hen's average ovarian weight is 0.03 g. The ovary of an immature hen is about15mm long and 5mm wide.

There are a large number of oocytes in the ovary, ranging from 600 to 500,000.12,000 oocytes can be observed under the microscope, but only a few of them reach mature ovulation. When hens were 4 months old and 5 months old, the weight of ovaries increased to 2.66 grams and 6.55 grams respectively.