TY - JOUR
T1 - Oxygen consumption of the chick embryo's respiratory organ, the chorioallantoic membrane
AU - Ar, Amos
AU - Girard, Henri
AU - Dejours, Pierre
PY - 1987/6
Y1 - 1987/6
N2 - A new technique based on stopping the chick embryo's blood circulation in the intact egg was used to measure in situ the chorioallantoic (CA) oxygen consumption, caO2, from incubation day 12 to 20. Total egg O2, totO2 and wet and dry masses of embryo and CA were also measured daily. Embryo O2, embO2, was calculated. Mean caO2 decreased from 71 μmol·h-1 (17% of totO2, 24% of embO2) at 12 days to 62μmol·h-1 (5% of totO2) at 20 days. Dry mass of CA did not change significantly. Water remained at a high level in CA (88-94%), but embryo water decreased from 93% to 82% between days 12 and 20. The fairly high level of caO2, more marked at young stages, calls for corrections in respiratory and circulatory embryonic variables derived from totO2, such as CA blood flow, CA diffusive capacity for O2, and CA arterio-venous shunt. Mass specific values and intra-specific allometric relations in bird embryos should be recalculated on the basis of embo2, instead of totO2.
AB - A new technique based on stopping the chick embryo's blood circulation in the intact egg was used to measure in situ the chorioallantoic (CA) oxygen consumption, caO2, from incubation day 12 to 20. Total egg O2, totO2 and wet and dry masses of embryo and CA were also measured daily. Embryo O2, embO2, was calculated. Mean caO2 decreased from 71 μmol·h-1 (17% of totO2, 24% of embO2) at 12 days to 62μmol·h-1 (5% of totO2) at 20 days. Dry mass of CA did not change significantly. Water remained at a high level in CA (88-94%), but embryo water decreased from 93% to 82% between days 12 and 20. The fairly high level of caO2, more marked at young stages, calls for corrections in respiratory and circulatory embryonic variables derived from totO2, such as CA blood flow, CA diffusive capacity for O2, and CA arterio-venous shunt. Mass specific values and intra-specific allometric relations in bird embryos should be recalculated on the basis of embo2, instead of totO2.
KW - Allometry
KW - Chick embryo
KW - Chorioallantois
KW - Egg
KW - Oxygen consumption
KW - Yolk sac
UR - http://www.scopus.com/inward/record.url?scp=0023193396&partnerID=8YFLogxK
U2 - 10.1016/S0034-5687(87)80022-1
DO - 10.1016/S0034-5687(87)80022-1
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AN - SCOPUS:0023193396
SN - 0034-5687
VL - 68
SP - 377
EP - 388
JO - Respiration Physiology
JF - Respiration Physiology
IS - 3
ER -