Age: Cockatiels usually start breeding between 1 and 2 years of age. If your cockatiels are younger than this, they may not yet be sexually mature.
Nutrition: A lack of essential nutrients can prevent cockatiels from laying eggs. Make sure your cockatiels are fed a high-quality diet that is rich in fruits, vegetables, and seeds.
Lighting: Cockatiels need at least 12 hours of light per day in order to breed. If the light cycle is too short, the cockatiels will not produce eggs.
Temperature: Cockatiels prefer a temperature of around 70 degrees Fahrenheit (21 degrees Celsius). If the temperature is too low or too high, the cockatiels may not breed.
Humidity: Cockatiels need a relative humidity of around 40-50%. If the humidity is too low or too high, the cockatiels may not breed.
Stress: Stress can prevent cockatiels from breeding. Cockatiels can be stressed by a variety of factors, such as changes in their environment, loud noises, or other animals.
Disease: Some diseases can prevent cockatiels from breeding. If you suspect that your cockatiels may be sick, take them to a veterinarian for diagnosis and treatment.
If you have ruled out all of these possible causes and your cockatiels are still not laying eggs, you may want to consult with an avian veterinarian.