(of an organism or tissue) living in the absence of air or free oxygen. pertaining to or caused by the absence of oxygen.
Parakeets can breed year round if conditions are right in their environment. Normal breeding season begins early in the year and continues until fall. It is very rare to see parakeets mating, but a male and a female must mate to keep the eggs fertile.
Obviously these eggs will be infertile and will not hatch If she does have a mate, they will lay eggs as long as they have access to a nest box and breeding stimulus (such as extended daylight) It is healthy for a parakeet to lay up to 2 clutches of eggs a year. A clutch is usually 4 eggs.