Development of ventilatory chemoreflexes in Coturnix quail chicks.

Abstract:

:Compared to mammals, little is known about the development of the respiratory control system in birds. In the present study, ventilation and metabolism were measured in Coturnix quail chicks exposed to room air, hypoxia (11 % O2), and hypercapnia (4% CO2) at 0-1, 3-4, and 6-7 days posthatching (dph). Mass-specific ventilation and metabolic rate tended to increase between 0-1 and 3-4 dph and then decrease again between 3-4 and 6-7 dph. The magnitude of the hypoxic ventilatory response (HVR) increased with age. The HVR also exhibited a biphasic shape in younger quail: after the initial increase in ventilation, ventilation declined back to (0-1 dph), or toward (4 dph), baseline. Older chicks (6-7 dph) had a "sustained HVR" in which ventilation remained high throughout the hypoxic challenge. The biphasic HVR did not appear to be caused by a decline in metabolic rate; although hypoxic hypometabolism was observed in quail chicks in all three age groups, the metabolic response appeared to occur more slowly than the biphasic HVR. The biphasic ventilatory response was also specific to hypoxia since the hypercapnic ventilatory response (HCVR) was characterized by a sustained increase in ventilation in all three age groups. The magnitude of the HCVR decreased with age. These results point to several similarities in the development of ventilatory chemorflexes between Coturnix quail and newborn mammals, including age-dependent (1) increases in the HVR, (2) transitions from a biphasic to a sustained HVR, and (3) decreases in the HCVR. Whether homologous mechanisms underlie these developmental changes remains to be determined.

authors

Song MJ,Pratt AE,Bavis RW

doi

10.1016/j.resp.2020.103411

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

103411

eissn

1569-9048

issn

1878-1519

pii

S1569-9048(19)30423-9

journal_volume

276

pub_type

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