(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.
When to mate. 1  litter size related to number of heats more than age or weight. 2  fewest ova at first estrus (heat) = smallest potential litter. 3  increase by about 1 ovum each for 2nd, 3rd heat so potential litter size increases. 4  normally breed in 2nd or 3rd heat so gilts farrow by 10-11 months of age.