ASPECTS OF CALORIC, NITROGEN AND MINERAL-NUTRITION DURING GROWTH IN NESTLING EASTERN BLUEBIRDS, SIALIA-SIALIS

Authors
HUNGERFORD BS STUDIER EH SZUCH EJ PACE GL TAYLOR S
Citation
Bs. Hungerford et al., ASPECTS OF CALORIC, NITROGEN AND MINERAL-NUTRITION DURING GROWTH IN NESTLING EASTERN BLUEBIRDS, SIALIA-SIALIS, Comparative biochemistry and physiology. Part A, Physiology, 106(2), 1993, pp. 385-389
Citations number
16
Categorie Soggetti
Physiology,Biology
Journal title
Comparative biochemistry and physiology. Part A, Physiology → ACNP
ISSN journal
10964940
Volume
106
Issue
2
Year of publication
1993
Pages
385 - 389
Database
ISI
SICI code
1096-4940(1993)106:2<385:AOCNAM>2.0.ZU;2-D
Abstract
1. Nestling eastern bluebirds experience a drop in live mass after 13 days of age; however, dry mass continues to increase. 2. Caloric densi ty 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. Quantities of select insects fed to ne stlings (to meet daily caloric requirements) do not satisfy certain el emental accretion requirements. 4. Fecal sac Ca levels indicate that n estlings scarcely receive a sufficient quantity of Ca to meet minimal growth requirements.