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Egg laying is a hormonal imbalance brought about by too much light since birds have a sensor in the brain (pituitary gland) regulating their hormones. It tells the body every day and every day of the year how to act.
Those birds were exposed to all the wrong things but primarily were not given a strict natural daylight schedule including dawn and dusk. Other triggers are dark nests, stroking excessively, exposure to other pairs, abundance of food mimicing spring but first and foremost the light issue has to be addressed. This is for all captive birds not just one showing symptoms.
Here's my standard post (written for someone else). This info also applies to hormonal males too.
QUOTE:
It's not breeding season in the Northern Hemisphere so your bird is having a hormonal imbalance. That comes from the days being too long like simulating spring/summer.
If you follow a strict natural daylight schedule including dawn and dusk this wont happen. No artificial lights after about 3 pm. She needs to go to sleep in a darkish room, no human interruptions like tv, radio, computers , people talking etc. A cover really doesnt cut it. They have a sensor in the brain (pituitary gland) regulated by light that controls the hormones telling the body what "time of year it is". Thats how they make chickens lay eggs 24/7 in factory farms by leaving lights on all the time. Then they die about age 3.
Right now in Pa, my birds go to sleep at about 5:40 pm and wake up about 7 am EST.
You can simulate with a dimmer in a small lamp placed on the floor (to simulate the angle of the sun) but it's trickier. Walmart sells a dimmer you screw in where the bulb goes and has a dial to turn it down, down, then off. The ones you tap arent right they only have three options.
So essentially follow the light schedule that is going on in your state at all times of year. For people in extreme climates like Alaska you have to adjust I never had a bird there, though.
Also decrease protein (including seeds), and vitamin e, and raise the greens and veggies.
Also no stroking beaks, feet, back or butts. That's a mating signal.
Dont allow her to "nest" in dark spots like behind pillows, in shirts, in drawers, bookcases, under toekicks of the kitchen cabinets, in closets etc.
Move her around to brightly lit spots all day, encourage her AWAY from her cage (nest), get her to fly around and find enrichment to do not focus all day long on her hormonal urges.
Change the inside of the cage around, change toys, perches, swap food and water bowls etc. These things are subliminal messages that it's not a "safe" nest.
All these things together will work to snap her hormones back into place but the lighting is number one. Then when it's "really" breeding season, she'll have an easier time of it. I don't know her age but it will be a yearly thing in breeding season so you want to minimize her anxiety all year long so it's only a mild deal every year not something she is fighting all year long. Especially now since it's winter.
UNQUOTE
I also posted this in the form of a vet article in the past but dont know where it went offhand. And she didnt emphasise the lighting enough and the dawn and dusk which is critical.
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