It is abnormal for a pigeon to lay one egg. First of all, you need to determine what year the hen you are raising is. Sometimes hens that are too old will lay single eggs. If it is a young pigeon, this will not happen.

Reasons for pigeons to lay an egg:

1. Being frightened. If a pigeon is frightened when laying eggs, it is very likely that it will only lay one egg, and it may also cause the pigeon to not hatch the egg. It is best not to disturb the pigeon when it is laying eggs.

2. Insufficient ovulation. Insufficient ovulation of a pigeon's ovary will also cause it to lay only one egg. Usually, as long as it is supplemented with more nutrients, it can make its ovulation more normal. At the same time, attention must be paid to the balance of nutrition.

3. Age issue. Pigeons that are too young or too old may also lay only one egg. Especially for pigeons that are too young, the eggs they lay are smaller than normal and may contain a little blood.