Individual study: Growth of blue-fronted amazon Amazona aestiva nestlings reared in captivity at the Centro de Reabilitação de Animais Silvestres, Campo Grande, Mato Grosso do Sul, Brazil
Seixas G.H.F. & Mourão G. (2003) Growth of nestlings of the blue-fronted amazon (Amazona aestiva) raised in the wild or in captivity. Ornitologia Neotropical, 14, 295-305
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Artificially incubate and hand-rear parrots in captivity
A replicated, controlled study at a rehabilitation centre in southern Brazil in 1997-9 (Seixas & Mourao 2003) found that hand-reared blue-fronted amazons Amazona aestiva grew for longer than wild birds (with an average growth period of 64 days for 124 captive-reared birds vs. 56 days for 86 wild nestlings). This meant that fledging weights of captive-reared birds were significantly higher than wild birds (average weights of 401.g for 34 captive males and 362 g to 28 females vs. 364 g for nine wild males and 343 g for 12 wild females). Birds were initially fed on a mix of mashed fruit, vegetables, corn flour and puppy food three times per day, changing to fruit, vegetables, seeds and grain as they grew.