Ventilation changes associated with hatching and maturation of an endothermic phenotype in the Pekin duck, Anas platyrhynchos domestica

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Tushar S Sirsat, Edward M Dzialowski

Abstract

Precocial birds begin embryonic life with an ectothermic metabolic phenotype and rapidly develop an endothermic phenotype after hatching. Switching to a high-energy, endothermic phenotype requires high-functioning respiratory and cardiovascular systems to deliver sufficient environmental oxygen to the tissues. We measured tidal volume (VT), breathing frequency (ƒ), minute ventilation (V̇e), and whole-animal oxygen consumption (V̇o2) in response to gradual cooling from 37.5°C (externally pipped paranates, EP) or 35°C (hatchlings) to 20°C along with response to hypercapnia during developmental transition from an ectothermic, EP paranate to endothermic hatchling. To examine potential eggshell constraints on EP ventilation, we repeated these experiments in artificially hatched early and late EP paranates. Hatchlings and artificially hatched late EP paranates were able to increase V̇o2significantly in response to cooling. EP paranates had high ƒ that decreased with cooling, coupled with an unchanging low VT and did not respond to hypercapnia. Hatchlings had significantly lower ƒ and higher VT and V̇e that increased with cooling and hypercapnia. In response to artificial hatching, all ventilation values quickly reached those of hatch...Continue Reading

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Citations

Mar 24, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Sarah K Goy SirsatEdward M Dzialowski
Oct 7, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Edward M DzialowskiEdwin R Price
Nov 10, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Edwin R Price, Edward M Dzialowski

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