Re: "Full Spectrum" Redux All birds are photoperiodic, Karen, even equatorial birds that normally have other breeding triggers, and this is used for eliminating off-season breeding in captivity because it's the one we have the most control over.
Of course, one could manipulate conditions so as to reproduce the seasons from the bird's natural habitat and even follow its solar schedule but why would anybody do it? It would require huge infrastructure (it's not only a matter of the length of the day but also the angle of the sun -and that it's very, very hard to reproduce artificially as it changes constantly as the earth rotates around the sun- plus climatological conditions -rainy and dry seasons, diet, etc), it would be incredibly time-consuming and expensive and, actually, all that work and time and money invested would really serve no purpose because birds adapt very well to their 'adopted' country schedule. There is nothing simpler, cheaper or safer than just following the local sun's schedule. |