It's really very reliable. I'm sure they are having dr Scott McDonald examine the birds. He travels around and does that sort of thing every day. If you plan on breeding, i'd never consider it without having him examine my breeders. he can tell alot by lapiscopically examining them. Typically a hen will only lay so many eggs in a life time. If they where spaced out over her life time then ,yes she could be laying viable eggs later in life. However if you where pulling 10 -15 eggs a year to incubate then she could become "burned out" very early in life. A lapiscopic exam could determine if that's the case. The ovaries get dark spots and lots of "bumps" on them , scarred tissue.Dr Scott has examined many thousands of parrots this way and is pretty good at guessing age and is worth his weight in gold if you want to know if your birds are viable.(or even mature)Hmm.... that sounds odd.
I have heard of parrots still reproducing without issues right around their expected lifespan! I've also heard of birds who can no longer produce at half of their expected lifespan...
It's an interesting theory, but it doesn't sound very reliable. Then again, I don't know of any reliable way of determining age in parrots once they mature!
Anyway, thank you for getting back to me on that! I wonder what they'll determine with the hyacinths!
They have got confidence with this technique. I have got twenty plus years keeping Parrots. Michelle has got thirty years experience breeding Parrots.