Aspects of caloric, nitrogen and mineral nutrition during growth in nestling eastern bluebirds, Sialia sialis
1. 1. Nestling eastern bluebirds experience a drop in live mass after 13 days of age; however, dry mass continues to increase. 2. 2. Caloric density and body concentrations of Fe, Mg, and Na remain constant, Ca and N concentrations increase, and K concentration decreases with nestling age. Daily nut...
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Published in | Comparative biochemistry and physiology. A, Comparative physiology Vol. 106; no. 2; pp. 385 - 389 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
New York, NY
Elsevier B.V
01.10.1993
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | 1.
1. Nestling eastern bluebirds experience a drop in live mass after 13 days of age; however, dry mass continues to increase.
2.
2. Caloric density and body concentrations of Fe, Mg, and Na remain constant, Ca and N concentrations increase, and K concentration decreases with nestling age. Daily nutrient accretions in nestling eastern bluebirds are much less than in non-passerines.
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3. Quantities of select insects fed to nestlings (to meet daily caloric requirements) do not satisfy certain elemental accretion requirements.
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4. Fecal sac Ca levels indicate that nestlings scarcely receive a sufficient quantity of Ca to meet minimal growth requirements. |
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ISSN: | 0300-9629 |
DOI: | 10.1016/0300-9629(93)90530-H |