Gas diffusive conductance of sea-level hen eggs incubated at 2900 m altitude

Handrich, Yves; Girard, Henri

doi:10.1016/0034-5687(85)90107-0

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…Since overall embryonic mass in H10 was lower (Fig.·1A) than the N21 group, the heart to body mass ratio was higher in the H10 group. Cardiac hypertrophy under hypoxic incubation has been shown previously in hatchling alligators (Warburton et al, 1995) and also in Florida red-bellied turtles (Kam, 1993), chickens (Handrich and Girard, 1985;AssonBatres et al, 1989;Dzialowski et al, 2002;Miller et al, 2002) and sheep (Gagnon et al, 1997). This relative change in heart mass could be partially attributed to an increase in cardiac function in an attempt to deliver adequate O 2 to developing tissues.…”

Section: Alteration In Growth Patternsmentioning

confidence: 68%

“…Embryonic mass was significantly reduced at 80% and 90% (Fig.·1A) and this was accompanied by an increased amount of yolk present at 90%, thus there was a reduced conversion of yolk to tissue due to hypoxia (Fig.·1B). Such changes have been previously observed in embryonic turtles and chickens incubated under hypoxic conditions (Metcalfe et al, 1984;Handrich and Girard, 1985;Kam, 1993) as well as embryonic alligators with altered eggshell conductance (Deeming and Ferguson, 1991). Indeed, hypoxic incubation is routinely used in chickens as a model of impaired fetal growth (Ruijtenbeek et al, 2000;Rouwet et al, 2002).…”

Section: Alteration In Growth Patternsmentioning

confidence: 74%

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Cardiovascular development in embryos of the American alligator Alligator mississippiensis: effects of chronic and acute hypoxia

Crossley

Altimiras

2005

Journal of Experimental Biology

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10%O 2 ) resulted in a lower mean arterial pressure at 90% of incubation, while heart rate was lower in the 10%O 2 group only. Acute (5·min) exposure to 10%O 2 in the normoxic group resulted in a biphasic response, with a normotensive bradycardia occurring during the period of exposure and a hypertensive tachycardic response occurring during recovery. The embryos incubated under hypoxia also showed a blunted response to acute hypoxic stress. In conclusion, the main responses elicited by chronic hypoxic incubation, namely, cardiac enlargement, blunted hypoxic response and systemic vasodilation, may provide chronically hypoxic embryos with a new physiological repertoire for responding to hypoxia.

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Section: Alteration In Growth Patternsmentioning

confidence: 68%

Section: Alteration In Growth Patternsmentioning

confidence: 74%

Cardiovascular development in embryos of the American alligator Alligator mississippiensis: effects of chronic and acute hypoxia

Crossley

Altimiras

2005

Journal of Experimental Biology

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“…If the eggs received adequate O 2 during incubation at a high altitude, the D breed had a high hatchability; regardless, they suffered the increase of water loss (to 15.35%) and CO 2 diffusion (hypocapnia) because of the low pressure at a 2,900-m altitude. Handrich and Girard (1985) reported that compensation for water loss alone at a 2,900-m altitude does not counteract the reduction in hatchability. Girard and Visschedijk (1987) reported that altitude hypocapnia alone, without hypoxia and excessive water loss, had almost no significant effect on the development and hatchability of the embryo at a 2,800m altitude.…”

Section: Discussionmentioning

confidence: 97%

Influences of Hypoxia on Hatching Performance in Chickens with Different Genetic Adaptation to High Altitude

et al. 2008

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The experiments were conducted to assess how hatching performance is affected by chicken breeds and environment of high altitude and to analyze the vital factor of the low hatchability at a 2,900-m altitude. Eggs of Tibetan and Dwarf chickens were incubated at conditions of normobaric normoxia, normobaric hypoxia, hypobaric hypoxia, and supplemental O2 at high altitude (hypobaric normoxia) during the whole incubation or at 0 to 7, 8 to 14, and 15 to 22 d of incubation, respectively. The results showed that the Tibetan chickens had greater hatchability (79.72%), lower water loss (12.90%), greater relative embryo weight (38.08%), and relative chick weight (68.41%) compared with the Dwarf chickens (31.69, 15.79, 30.71, and 65.21%, respectively) when both of them were incubated at a 2,900-m altitude. The hatchability was 71.60% in Tibetan chicken and 36.23% in Dwarf chicken under the normobaric hypoxia condition. The hatchability of chicken was efficiently increased with supplemental O2. The previous results indicated that the O2 deficit is the main factor resulting in the low hatchability and the poor chick quality of the lowland chicken breed when incubated at a 2,900-m altitude. Breeding chickens for adaptability to hypoxia and supplemental O2 is a good way to improve the hatchability and chick quality at that altitude.

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“…Blood vasculature is also increased by decreasing atmospheric pressure (Snyder et al, 1984). Handrich and Girard (1985) reported reduced PCV and Hb due to simulated high altitude, hi the current study, the turkey embryos at high altitude responded to the respiratory requirement of pipping and hatching by increasing Hb and PCV and by decreasing MCV (Table 1). The increase in Hb is functionally significant, because it increases the oxygen carrying capacity of the blood to compensate for hypoxia (Tazawa and Piiper, 1984) and perhaps hypercapnia (Girard and Visschedijk, 1987).…”

Section: Discussionmentioning

confidence: 63%

Hematological Indices of Turkey Embryos Incubated at High Altitude as Affected by Oxygen and Shell Permeability

1990

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Turkey eggs (Meleagris gallopavo) were incubated at an altitude of 1,707 m to test the effects of oxygen supplementation and increased eggshell permeability by removal of shell cuticle on embryonic hematology. Turkey embryo hematological indices measured were red blood cell count (RBC), hemoglobin concentration, packed cell volume, mean cellular volume, mean cellular hemoglobin, and percentage of reticulocytes. Although hemoglobin concentration measured during pipping increased as expected by increasing RBC, no significant differences were observed between oxygenation, or permeability treatments, or their interaction. Under the high altitude conditions of the present experiment, increased hemoglobin concentrations in all treatments corresponded to increased numbers of erythrocytes with constant mean cellular hemoglobin. None of the remaining hematological indices examined was affected by oxygen or permeability treatments. It was concluded that turkey embryos incubating at 1,707-m elevation make no additional changes in hemoglobin concentrations during the plateau stage in oxygen consumption (25, 26, and 27 days of incubation) when exposed to increased oxygen tension (151 mm Hg versus 135 mm Hg) or increased eggshell permeability (19.9 mg H2O/day per mm Hg versus 23.2 mg H2O/day per mm Hg).

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Gas diffusive conductance of sea-level hen eggs incubated at 2900 m altitude

Cited by 11 publications

References 23 publications

Cardiovascular development in embryos of the American alligator Alligator mississippiensis: effects of chronic and acute hypoxia

Cardiovascular development in embryos of the American alligator Alligator mississippiensis: effects of chronic and acute hypoxia

Influences of Hypoxia on Hatching Performance in Chickens with Different Genetic Adaptation to High Altitude

Hematological Indices of Turkey Embryos Incubated at High Altitude as Affected by Oxygen and Shell Permeability

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