Poultry Judging Practice Test

The shell formation in bird eggs primarily occurs in which part of the reproductive system?

1. Infundibulum

2. Ovary

3. Vagina

4. Uterus

The correct answer is: Uterus

The correct answer is the uterus, as it is the part of the reproductive system where the shell of the egg is formed. The process begins when the ovary releases the ovum, which travels through the oviduct. As the egg progresses through the oviduct, it passes through several sections where different components are added: the infundibulum adds the chalaza and some albumen, while the isthmus adds more albumen and the inner and outer shell membranes. However, it is in the uterus, also known as the shell gland, that the final and most significant process of shell formation occurs. During its time in the uterus, the egg's shell is formed from calcium carbonate, which is deposited in layers around the egg white and membranes. This process can take several hours, and the size and quality of the shell are impacted by factors such as the hen's diet and health. This role of the uterus is crucial, making it the key section of the reproductive system responsible for creating the protective shell that surrounds bird eggs.