2. The appearance and life characteristics of chickens.

3. Appearance characteristics of chicken.

4. Appearance composition and characteristics of chicken.

1. Jitou: The crown of the head is a derivative of the skin, which is located on the top of the head and is an epithelial structure rich in blood vessels.

2. Different varieties have different crown shapes.

3. Even the same crown shape, different varieties, there are differences.

4. There are many kinds of cockscomb, which is an important feature of the variety. They can be divided into single cockscomb, bean cockscomb, rose cockscomb, strawberry cockscomb and feather cockscomb.

5. Chicken neck: The chicken neck is composed of 13 to 14 cervical vertebrae due to different breeds and different neck lengths.

6. Egg-type chickens have long and thin necks, while meat-type chickens have short and thick necks.

7. Chicken body: It consists of three parts: chest, abdomen and tail, which is closely related to gender, production performance and health status.

8. The chest is the location of the heart and lungs. It should be wide, deep and developed, which means not only strong body, such as broilers, but also developed chest muscles.

9. Chicken limbs: Birds adapt to flying, and their forelimbs develop into wings, also called wings.

10. The condition of wings can reflect the health status of birds.

1 1. Normal chicken wings should be close to the body, and sagging is a sign of weakness.

12. Birds have long bones in their hind limbs, the femur wraps the human body, the tibia is muscular, the shape is called thigh, and the feet are slender, and the shape is often called Gaskin.