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 inComparative biochemistry and physiology. A, Comparative physiology Vol. 106; no. 2; pp. 385 - 389
Main Authors Hungerford, Brian S, Studier, Eugene H, Szuch, Ernest J, Pace, Gary L, Taylor, Susan
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier B.V 01.10.1993
Elsevier
Subjects
Biological and medical sciences
Feeding. Feeding behavior
Fundamental and applied biological sciences. Psychology
Vertebrates: anatomy and physiology, studies on body, several organs or systems
Nesting
Vertebrata
Nutrition
Growth
Ions
Aves
Nitrogen
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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. 3. 3. Quantities of select insects fed to nestlings (to meet daily caloric requirements) do not satisfy certain elemental accretion requirements. 4. 4. Fecal sac Ca levels indicate that nestlings scarcely receive a sufficient quantity of Ca to meet minimal growth requirements.
ISSN:0300-9629
DOI:10.1016/0300-9629(93)90530-H