(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.
Confidence votes 5. I am presuming that you mean when do they mate in the year, eg. what is their breeding season. Typically, Cockatiels mate from August to December, but the Breeding season often goes for the whole year. If you mean what age they mate, usually when they are fully developed.