Cost of growth and maintenance in chicken embryos during normoxic or hypoxic conditions

Respiratory Physiology & Neurobiology
J P Mortola, Elizabeth Cooney

Abstract

During a large portion of embryonic development oxygen consumption (V(O2)) is mainly needed for maintenance (including organ function) and for growth. In an attempt to evaluate their relative contribution, we followed the assumption that the former is proportional to embryo's weight (W) and the latter to growth rate (GR), as V(O2)=aW+bGR, a and b being the respective proportionality coefficients. Fertile chicken eggs were incubated at the normal temperature (38 degrees C) and at various low-temperature conditions, which invariably decreased GR. At a few days intervals over the embryonic ages E9-E18, the W and V(O2) of the embryos were measured and GR computed from the age-W relationship. These simultaneous sets of W (g), GR (g/day) and V(O2) (ml/day) were used to solve the equation; a averaged 14.7 ml O(2) g(-1) day(-1) and b averaged 41.1 ml O(2) g(-1). Hence, over the period of incubation studied, the cost of growing 1g of tissue averaged about 3 times the cost of maintaining it. These coefficients were not significantly different whether computed during normal growth at 38 degrees C or during incubation at low temperatures, indicating that cooling only decreased GR and the cost required by it. Embryos incubated in hypoxia (1...Continue Reading

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Citations

Jun 5, 2013·Respiratory Physiology & Neurobiology·Jacopo P MortolaPaula A Toro Velasquez
Dec 21, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·L PinedaA Chwalibog
May 17, 2011·Respiratory Physiology & Neurobiology·Peter Rombough
Nov 17, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Jacopo P MortolaKhalid Al Awam
Nov 4, 2008·Respiratory Physiology & Neurobiology·Kirsten Ferner, Jacopo P Mortola
Aug 5, 2015·Poultry Science·A NangsuayH van den Brand
Oct 12, 2011·Journal of Vascular Research·Emilio A HerreraDino A Giussani
Apr 28, 2019·The Journal of Experimental Biology·Lara do Amaral-SilvaKênia Cardoso Bícego
Jan 26, 2017·Frontiers in Physiology·Isaac Peña-VillalobosPablo Sabat
Mar 4, 2021·Poultry Science·Amit HaronShelly Druyan
Mar 17, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Jacopo P Mortola
Apr 12, 2011·Respiratory Physiology & Neurobiology·Jacopo P Mortola

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