01923naa a2200229 a 450000100080000000500110000800800410001910000210006024501050008126000090018652012650019565000130146065000250147365300200149865300240151865300180154265300220156065300240158265300200160670000150162677300520164118109542017-03-27       2003    bl uuuu     u00u1 u    #d1 aSEIXAS, G. H. F.  aGrowth of nestlings of the Blue-fronted Amazon (Amazona aestiva) raised in the wild or in captivity.  c2003  aFrom 1997 to 1999, we analyzed growth in body mass and wing lenghts of nestlings from a population of Blue-fronted Amazons (Amazona aestiva) living freely in the Pantanal of South Mato Grosso and nestlings raised in Centre for Rehabilitation of Wild Animals (CRAS). We studied whether sex, age, birth order and ectoparasite infestation affected their growth. To describe their growth, we used Richard's model to estimate the asymptotic size "A", total growth period "T" and a parameter, "m", which describes the form of the curve. The two groups presented similar asymptotic body masses. However, the nestlings raised in captivity took more time to attain their asymptotic mass and took 55% more time to attain their asymptotic wing lenght. Analysis of deviation from the mass predicted by the Richard's model did not reveal any differences between sexes or the manner in which they were raising. However, ANOVA revealed that immediately before being released the parrots at CRAS weighed more than those natural habitat before fledging into the wild. The rate of increase in  mass varied among years for birds in capativity but not for birds in the wild. Infestation by ectoparasites, and nestling order negatively affected the growth of nestlings in the wild.  aPantanal  aCurva de Crescimento  aAmazona aestiva  aBlue-fronted Amazon  aGrowth curves  aModelo de Richard  aPapagaio-verdadeiro  aRichard's model1 aMOURAO, G.  tOrnitologia Neotropicalgv.14, p.295-305, 2003.