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Huang S, Zhang L, Rehman MU, Iqbal MK, Lan Y, Mehmood K, Zhang H, Qiu G, Nabi F, Yao W, Wang M, Li J. High altitude hypoxia as a factor that promotes tibial growth plate development in broiler chickens. PLoS One 2017; 12:e0173698. [PMID: 28282429 PMCID: PMC5345845 DOI: 10.1371/journal.pone.0173698] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 02/25/2017] [Indexed: 01/21/2023] Open
Abstract
Tibial dyschondroplasia (TD) is one of the most common problems in the poultry industry and leads to lameness by affecting the proximal growth plate of the tibia. However, due to the unique environmental and geographical conditions of Tibet, no case of TD has been reported in Tibetan chickens (TBCs). The present study was designed to investigate the effect of high altitude hypoxia on blood parameters and tibial growth plate development in chickens using the complete blood count, morphology, and histological examination. The results of this study showed an undesirable impact on the overall performance, body weight, and mortality of Arbor Acres chickens (AACs) exposed to a high altitude hypoxic environment. However, AACs raised under hypoxic conditions showed an elevated number of red blood cells (RBCs) and an increase in hemoglobin and hematocrit values on day 14 compared to the hypobaric normoxia group. Notably, the morphology and histology analyses showed that the size of tibial growth plates in AACs was enlarged and that the blood vessel density was also higher after exposure to the hypoxic environment for 14 days, while no such change was observed in TBCs. Altogether, our results revealed that the hypoxic environment has a potentially new role in increasing the blood vessel density of proximal tibial growth plates to strengthen and enhance the size of the growth plates, which may provide new insights for the therapeutic manipulation of hypoxia in poultry TD.
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Affiliation(s)
- Shucheng Huang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Lihong Zhang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Mujeeb Ur Rehman
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Muhammad Kashif Iqbal
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Yanfang Lan
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Khalid Mehmood
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Hui Zhang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Gang Qiu
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
- Laboratory of Detection and Monitoring of Highland Animal Disease, Tibet Agriculture and Animal Husbandry College, Linzhi Tibet, People's Republic of China
| | - Fazul Nabi
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
- Faculty of Veterinary & Animal Sciences, Lasbela University of Agriculture, Water and Marine Sciences Uthal, Balochistan, Pakistan
| | - Wangyuan Yao
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Meng Wang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Jiakui Li
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, People's Republic of China
- Laboratory of Detection and Monitoring of Highland Animal Disease, Tibet Agriculture and Animal Husbandry College, Linzhi Tibet, People's Republic of China
- * E-mail:
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Jia C, He L, Li P, Liu H, Wei Z. Effect of egg composition and oxidoreductase on adaptation of Tibetan chicken to high altitude. Poult Sci 2016; 95:1660-1665. [DOI: 10.3382/ps/pew048] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/03/2016] [Indexed: 12/17/2022] Open
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Szabo Z, Klein A, Jakab C. Hematologic and plasma biochemistry reference intervals of healthy adult barn owls (Tyto alba). Avian Dis 2014; 58:228-31. [PMID: 25055626 DOI: 10.1637/10715-111013-reg.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Hematologic and plasma biochemistry parameters of barn owls (Tyto alba) were studied in collaboration by the Exotic Division of the Faculty of Veterinary Science of the Szent Istvan University and the Eötvös Loránd University, both in Budapest, Hungary. Blood samples were taken from a total of 42 adult barn owls kept in zoos and bird repatriation stations. The following quantitative and qualitative hematologic values were determined: packed cell volume, 46.2 +/- 4%; hemoglobin concentration, 107 +/- 15 g/L; red blood cell count, 3.2 +/- 0.4 x 10(12)/L; white blood cell count, 13.7 +/- 2.7 x 10(9)/L; heterophils, 56.5 +/- 11.5% (7.8 +/- 2 x 10(9)/L); lymphocytes, 40.3 +/- 10.9% (5.5 +/- 1.9 x 10(9)/L); monocytes, 1.8 +/- 2.1% (0.3 +/- 0.3 x 10(9)/ L); eosinophils, 1 +/- 1% (0.1 +/- 0.1 x 10(9)/L); and basophils, 0.6 +/- 0.5% (0.1 +/- 0.1 x 10(9)/L). The following plasma biochemistry values also were determined: aspartate aminotransferase, 272 +/- 43 U/L; L-gamma-glutamyltransferase, 9.5 +/- 4.7 U/L; lipase, 31.7 +/- 11.1 U/L; creatine kinase, 2228 +/- 578 U/L; lactate dehydrogenase, 1702 +/- 475 U/L; alkaline phosphatase, 358 +/- 197 U/L; amylase, 563 +/- 114 U/L; glutamate dehydrogenase, 7.5 +/- 2.5 U/L; total protein, 30.6 +/- 5.3 g/L; uric acid, 428 +/- 102 micromol/L; and bile acids, 43 +/- 18 micromol/L. These results provide reliable reference values for the clinical interpretation of hematologic and plasma biochemistry results for the species.
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Gou W, Peng J, Wu Q, Zhang Q, Zhang H, Wu C. Expression pattern of heme oxygenase 1 gene and hypoxic adaptation in chicken embryos. Comp Biochem Physiol B Biochem Mol Biol 2014; 174:23-8. [PMID: 24947210 DOI: 10.1016/j.cbpb.2014.05.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Revised: 04/09/2014] [Accepted: 05/30/2014] [Indexed: 11/26/2022]
Abstract
Heme oxygenase 1 (HO-1), a rate-limiting enzyme of heme catabolism, has a crucial role of cytoprotective functions under hypoxia. The objective of the present study was to investigate potential differences in protective effect of HO-1 gene on chicken (Gallus gallus) embryo lung during late incubation. At embryonic day (D) D16, D18, D19, and D20 of incubation, the expression of HO-1 in the lungs of chicken embryos (Tibet and Shouguang chickens) incubated in normoxic (21% O2) and hypoxic (13% O2) conditions was measured. SNPs were screened within 5'-flanking region and coding regions with PCR-sequencing and the genotype of the SNPs was determined with PCR-RFLP in Tibet, Chahua and Shouguang chicken populations. In conclusion, the Tibet chicken had higher HO-1 expression on D19 under hypoxic incubation and had two SNPs with different frequency distributions from other chicken breeds, which might be a way that the Tibet chicken had hereditary adaptation to hypoxia during embryonic development.
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Affiliation(s)
- Wenyu Gou
- National Engineering Laboratory For Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Junfei Peng
- National Engineering Laboratory For Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Qian Wu
- School of Biological Science and Medical Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100191, China
| | - Qian Zhang
- National Engineering Laboratory For Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Hao Zhang
- National Engineering Laboratory For Animal Breeding, China Agricultural University, Beijing 100193, China.
| | - Changxin Wu
- National Engineering Laboratory For Animal Breeding, China Agricultural University, Beijing 100193, China
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Hematologic and plasma biochemistry values in white storks (Ciconia ciconia). J Zoo Wildl Med 2010; 41:17-21. [PMID: 20722249 DOI: 10.1638/2008-0164.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hematologic and plasma biochemistry parameters of the white stork (Ciconia ciconia) were studied. Blood samples were taken from a total of 80 adult white storks kept in captivity in Hungarian zoos and bird repatriation stations, between 2002 and 2006. Hematologic (packed cell volume, 46.3% +/- 5.3%; hemoglobin concentration, 127.8 +/- 20.4 g/L; red blood cell counts, 2.28 +/- 0.35 10(12)/l/l; white blood cell counts, 21.6 +/- 4.2 10(9)/l/ l; heterophils, 61.0% +/- 9.8% [13.1 +/- 3.2 x 10(9)/L]; lymphocytes, 34.3% +/- 9.1% [7.4 +/- 2.5 x 10(9)/L]; monocytes, 3.44% +/- 2.3% [0.78 +/- 0.57 x 10(9)/L]; eosinophils 0.75% +/- 0.91% [0.16 +/- 0.21 x 10(9)/L]; basophils 0.38% +/- 0.56% [0.04 +/- 0.07 x 10(9)/L]) and plasma biochemistry values (aspartate aminotransferase, 267.5 +/- 145.8 U/L; L-gamma-glutamyltransferase, 47.6 +/- 49.3 U/L; lipase, 70.3 +/- 60.6 U/L; creatine kinase, 443.9 +/- 182.2 U/L; lactate dehydrogenase, 880.4 +/- 293.6 U/L; alkaline phosphatase, 177.5 +/- 116.6 U/L; amylase, 917.6 +/- 314.3 U/L; glutamate dehydrogenase, 7.3 +/- 4.0 U/L; total protein, 45.2 +/- 8.1 g/L; uric acid, 459.2 +/- 254.3 micromol/L; and bile acids, 46.3 +/- 20.5 micromol/L) were determined. The results obtained can be used as reference values, because there are no established values previously reported for adult white storks.
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Liu C, Zhang LF, Song ML, Bao HG, Zhao CJ, Li N. Highly efficient dissociation of oxygen from hemoglobin in Tibetan chicken embryos compared with lowland chicken embryos incubated in hypoxia. Poult Sci 2010; 88:2689-94. [PMID: 19903969 DOI: 10.3382/ps.2009-00311] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Oxygen is one of the critical determinants for normal embryonic and fetal development. In avian embryos, lack of oxygen will lead to high fetal mortality, heteroplasia, and cardiovascular dysfunction. Tibetan chicken is a breed native to Tibet that could survive and keep higher hatchability regardless of negative effects of hypoxia. Generally, adaptive animals in high altitudes are characterized by higher hemoglobin concentrations and oxygen affinity. In the present study, the capacity of oxygen supply in late chick embryo (including d 17, 19, and 21) was compared between Tibetan chicken and a lowland breed, Dwarf White chicken, by determining the hemoglobin concentrations and oxygen equilibrium curves in both hypoxic (13% O(2)) and normoxic (21% O(2)) conditions. The results showed that a higher level of hemoglobin concentration was induced by hypoxia in Tibetan chicken embryos, and the hemoglobin could perform with better cooperativity and deliver oxygen to tissues more easily. Further investigation revealed that the carbonic anhydrase II mRNA in red blood cells of Tibetan chicken was increasingly induced to a higher level in hypoxia than that of the lowland breed. These results suggested that the stronger capacity of oxygen dissociation was an important characteristic of Tibetan chicken embryo to survive in hypoxia and the upregulating mode of carbonic anhydrase II mRNA might assist this dissociation. Therefore, for avian at high altitudes, the efficient dissociation of oxygen might reveal another aspect associated with the hypoxia adaptability.
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Affiliation(s)
- C Liu
- State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100193, China
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Wei ZH, Zhang H, Jia CL, Ling Y, Gou X, Deng XM, Wu CX. Blood gas, hemoglobin, and growth of Tibetan chicken embryos incubated at high altitude. Poult Sci 2007; 86:904-8. [PMID: 17435024 DOI: 10.1093/ps/86.5.904] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Metabolism and hatchability are impaired when chicken eggs laid at sea level are incubated at high altitude. The Tibetan chicken is an excellent local poultry breed that inhabits altitudes of 2,900 m and has a hatchability of approximately 75% at that altitude. To understand how Tibetan chicken embryos develop successfully at high altitude, we compared blood gas, pH, hemoglobin concentrations and embryo mass for Tibetan chicken embryos (T) and for embryos from a dwarf breed (D) that normally is reared at sea level. The 2 breeds (T and D) and 2 incubation altitudes (2,900 m = high, H; and 100 m = low, L) were compared at 9, 12, 15, and 18 d of incubation. Embryo weights were lower for the high altitude groups (TH, DH) than for the low altitude groups at all stages of incubation. The embryo mass of TH appeared to increase more quickly than that of DH. Compared with DH, TH embryos had lower arterialized oxygen partial pressure on d 18, higher venous carbon dioxide partial pressure from d 12 to 18, and higher hemoglobin concentration and lower venous blood pH values on d 12 and 15. These findings indicate that the ability of the Tibetan chicken embryos to adapt to the high altitude may be due to the increase in hemoglobin concentration, which augments the blood oxygen-carrying capacity. In addition, the higher venous carbon dioxide partial pressure and lower venous blood pH promote unloading of oxygen from hemoglobin.
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Affiliation(s)
- Z H Wei
- College of Animal Science and Technology, China Agricultural University, Beijing, 100094, China
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Gou X, Li N, Lian L, Yan D, Zhang H, Wei Z, Wu C. Hypoxic adaptations of hemoglobin in Tibetan chick embryo: high oxygen-affinity mutation and selective expression. Comp Biochem Physiol B Biochem Mol Biol 2007; 147:147-55. [PMID: 17360214 DOI: 10.1016/j.cbpb.2006.11.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2006] [Revised: 10/28/2006] [Accepted: 11/23/2006] [Indexed: 11/17/2022]
Abstract
Tibetan chicks (Gallus gallus) survived with high hatchability (35.0%) and Recessive White Feather broilers (RWF) from low elevations survived rarely and with a low hatchability (3.0%) after simulated incubation under hypoxia of 13% O2. The functional mutation of Met-32D(B13)-Leu of alpha(D) globin chain was related with hypoxia based on allele distribution, homology model building and oxygen affinity assay. Whole embryos on days 3-8 and whole blood on days 9-18 were collected to investigate the stage expression profiles of all seven globins and HIF-1alpha by real-time PCR. Under hypoxia (12.0% O2) on days 3-8, HbE was overexpressed, HbA was expressed earlier and HbP expression was restricted, which completely overturned the expression profile under normoxia. The amount of hemoglobin expression in Tibetan chicks was remarkably higher than that of RWF. HIF-1alpha expression peaked early in both breeds, with. In conclusion, the special hypoxic expression profile on days 3-8 certainly is a common molecular mechanism of hypoxia tolerance in surviving Tibetan chick and RWF embryos; the mutation Met-32D(B13)-Leu and increasing hemoglobins are important mechanisms of hypoxia adaptation in Tibetan chick embryos, and we suggest that HIF-1alpha could be responsible for the hypoxic expression profile.
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Affiliation(s)
- Xiao Gou
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
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León-Velarde F, Monge-C C. Avian embryos in hypoxic environments. Respir Physiol Neurobiol 2004; 141:331-43. [PMID: 15288603 DOI: 10.1016/j.resp.2004.02.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2004] [Indexed: 11/29/2022]
Abstract
Avian embryos at high altitude do not benefit of the maternal protection against hypoxia as in mammals. Nevertheless, avian embryos are known to hatch successfully at altitudes between 4,000 and 6,500 m. This review considers some of the processes that bring about the outstanding modifications in the pressure differences between the environment and mitochondria of avian embryos in hypoxic environments. Among species, some maintain normal levels of oxygen consumption ( VO2) have a high oxygen carrying capacity, lower the air cell-arterial pressure difference ( PAO2 - PaO2 ) with a constant pH. Other species decrease VO2, increase only slightly the oxygen carrying capacity, have a higher PAO2 - PaO2 difference than sea-level embryos and lower the PCO2 and pH. High altitude embryos, and those exposed to hypoxia have an accelerated decline of erythrocyte ATP levels during development and an earlier stimulation of 2,3-BPG synthesis. A higher Bohr effect may ensure high tissue PO2 in the presence of the high-affinity hemoglobin. Independently of the strategy used, they serve together to promote suitable rates of development and successful hatching of high altitude birds in hypoxic environments.
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Affiliation(s)
- F León-Velarde
- Laboratorio de Transporte de Oxígeno/IIA, Departamento de Ciencias Biológicas y Fisiológicas, Universidad Peruana Cayetano Heredia, Apartado 4314, Lima 100, Peru.
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Dzialowski EM, von Plettenberg D, Elmonoufy NA, Burggren WW. Chronic hypoxia alters the physiological and morphological trajectories of developing chicken embryos. Comp Biochem Physiol A Mol Integr Physiol 2002; 131:713-24. [PMID: 11897182 DOI: 10.1016/s1095-6433(02)00009-0] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Chicken embryos were chronically exposed to hypoxia (P(O(2)) approximately 110 mmHg) during development, and assessed for detrimental metabolic and morphological effects. Eggs were incubated in one of four groups: control (i.e. 151 mmHg), or treated with continuous 110 mmHg (15% O(2)) during days 1-6 (H1-6), 6-12 (H6-12), or 12-18 (H12-18) with normoxia during the remaining incubation. Metabolism (V(O(2))), body mass, hemoglobin (Hb) and hematocrit (Hct) were measured in embryos on days 12 and 18 of incubation and in day-old hatchlings. Ability to maintain V(O(2)) was acutely measured during a step-wise decrease in P(O(2)) from normoxia to hypoxia (55 mmHg). On day 12, V(O(2)) of H1-6 eggs were significantly lower than in the control and H6-12 eggs. P(crit) in H6-12 eggs was lower than in control and H1-6 eggs. Body mass of H1-6 and H6-12 embryos on day 12 was significantly lower than in control embryos, while in H6-12 embryos, Hct and Hb were higher. On day 18, H6-12 embryos had significantly lower V(O(2)) than control eggs. Body mass of H6-12 and H12-18 embryos was significantly lower than control embryos. Hct and Hb did not differ between treatments. In hatchlings, mass, Hb and Hct had returned to values statistically identical to controls. However, H6-12 embryos had significantly lower V(O(2)). Long-term hypoxia altered V(O(2)) when hypoxic incubation occurred during the middle third of incubation, but not during earlier or later incubation. Thus, chronic hypoxic exposure during critical periods in development altered the developmental physiological trajectories and modified the phenotypes of the developing embryos.
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Dragon S, Carey C, Martin K, Baumann R. Effect of high altitude and in vivo adenosine/(β)-adrenergic receptor blockade on ATP and 2,3BPG concentrations in red blood cells of avian embryos. J Exp Biol 1999; 202 (Pt 20):2787-95. [PMID: 10504314 DOI: 10.1242/jeb.202.20.2787] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In chick embryos, developmental changes of the blood oxygen tension control hemoglobin (Hb) oxygen affinity via modulation of ATP and 2, 3BPG concentrations in red blood cells. Hypoxia, which is a normal developmental condition for late chick embryos, causes a decrease of the red cell ATP concentration (and increase of red cell oxygen affinity) as well as activation of 2,3BPG synthesis via cyclic AMP-dependent signaling. Adenosine and catecholamines have been implicated as signaling substances in these red cell responses. To assess the extent to which adenosine and catecholamines are involved in vivo in the control of red cell ATP/2,3BPG concentrations, day 13 chick embryos were treated for 24 h with adenosine A(2) and/or (β)-adrenergic receptor blockers and red cell ATP and 2,3BPG levels were determined. The data suggest that adaptive effects later in development in chick embryos induced by adenosine and catecholamines are vital. We have also tested whether avian embryos of the free-living, high-altitude, native white-tailed ptarmigan (Lagopus leucurus) alter their organic phosphate pattern in red cells in response to incubation at different altitudes. Embryos incubated at 3600–4100 m decrease their red cell ATP concentration much more rapidly than embryos of the same clutch incubated at 1600 m. From these data it can be inferred that the oxygen affinity of high altitude embryos will be adjusted to the altitude at which the eggs are incubated.
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Affiliation(s)
- S Dragon
- University of Regensburg, Department of Physiology, Germany, University of Colorado, Department of EPO Biology, Boulder, CO 80309, USA and Canadian Wildlife Service, Rural Route 1, Delta, British Columbia, Canada, V4K 3N2. Stefanie.dragon@vkl
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León-Velarde F, Monge C, Carey C. Physiological Strategies of Oxygen Transport in High Altitude Bird Embryos. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0300-9629(96)00373-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Carey C, Martin K. Physiological ecology of incubation of ptarmigan eggs at high and low altitudes. WILDLIFE BIOLOGY 1997. [DOI: 10.2981/wlb.1997.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Cynthia Carey
- Cynthia Carey, Department of EPO Biology, University of Colorado, Boulder, Colorado 80309 USA
| | - Kathy Martin
- Kathy Martin, Canadian Wildlife Service, 5421 Robertson Road, Rural Route 1, Delta, British Columbia, Canada V4K 3N2
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Structural and physiological differences between montane and lowland avian eggs and embryos. J Biosci 1994. [DOI: 10.1007/bf02703179] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Gas exchange and blood gases of Puna teal (Anas versicolor puna) embryos in the Peruvian Andes. J Comp Physiol B 1994. [DOI: 10.1007/bf00369515] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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