by Pajarita » Thu Feb 20, 2014 3:05 pm
Well, I am going to disagree with Michael. The 12L/12D schedule was very avant-garde about 15 years ago and, although it provides the bird with enough sleep, it doesn't prevent them from producing sexual hormones all year round and that means a screwed up endocrine system which, in turn, it means a depressed immune system. Tropical birds would almost get a natural schedule of 12L/12D in the wild (there is actually a 20 minute difference between the seasons) but their primary breeding trigger is food availability which doesn't work in captivity because we give them the same kind and amount of food all year round - aside from the fact that not all parrots are tropical, some are semi-tropical and some are from temperate zones. So, even though the bird will get enough sleep with this schedule, you can easily end up with a sexually frustrated parrot, an off-season or a chronic layer.
Personally, I like to follow nature's way and keep all my birds at a strict solar schedule with full exposure to dawn and dusk, just like the wild birds have.