Theory question 107
Animal ReproductionDescribe briefly the processes of egg formation in poultry.
Show the model answer
Model answer
Ovary releases the mature yolk (ovum) into the infundibulum, where fertilisation takes place (about 15–30 minutes)
Magnum: thick albumen added (about 3 hours)
Isthmus: inner and outer shell membranes formed, shape fixed (about 1¼ hours)
Uterus (shell gland): thin albumen and water added, shell (calcium carbonate) and pigment deposited (about 20 hours)
Vagina: cuticle added; egg passes to the cloaca and is laid; whole process about 24–26 hours
Explanation
Describe the parts in order with what each adds.