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Type: Journal article
Title: Development of Thermoregulation and Posthatching Growth in the Altricial Cockatiel Nymphicus hollandicus
Author: Pearson, James Todd
Citation: Physiological Zoology, 1998; 71(2):237-244
Issue Date: 1998
ISSN: 0031-935X
Statement of
James T. Pearson
Abstract: The development of thermoregulation and growth during the nestling period of cockatiel Nymphicus hollandicus were examined in this study. It was hypothesised that, in comparison to other altricial species of similar body mass, cockatiel chicks develop endothermy earlier and consequently have less energy available for growth, resulting in reduced growth rates. While poorly insulated and blind at hatching, cockatiel developed endothermic responses in their first week, and were individually effectively homeothermic (with 75% of adult ability to maintain body temperature during exposure to 20°–25°C), by maintaining high metabolic rates (at all ambient temperatures tested) above the predicted resting rates of an adult of similar body mass before parental brooding ceased (12–13 d). Mass‐independent metabolic rates were equivalent to those of fledglings at only 20% of the nestling period (37 d), well before adequate insulation was obtained. The Gompertz growth constants of cockatiel were significantly lower than those of other altricial land birds, which supports the hypothesis of this study.
Rights: © 1998 by The University of Chicago
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Appears in Collections:Zoology publications

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