Document Detail

Effect of hypobaric hypoxia on lamb intrauterine growth: comparison between high- and low-altitude native ewes.
MedLine Citation:
PMID:  15907274     Owner:  NLM     Status:  MEDLINE    
The present studies assessed the effect of hypobaric hypoxia on fetal lamb growth in high-altitude (HA) and low-altitude (LA) native ewes. Growth patterns of fetal biparietal diameter (BPD), abdominal diameter (AD) and thorax height (TH) were described by consecutive ultrasound measurements throughout the entire pregnancy. Three groups of animals were used: (1) pregnant LA ewes kept at LA (control; 'LL' group); (2) pregnant LA ewes moved to HA immediately after confirmation of pregnancy ('LH' group); and (3) pregnant HA ewes kept at HA throughout the entire pregnancy ('HH' group). The slope of the BPD curve was higher in LL fetuses followed by that in LH fetuses. During the last month of pregnancy, TH was higher in LH and HH fetuses, whereas AD was higher in LL than in LH fetuses. The length of gestation was longer in HH ewes (153.2 +/- 4.3 days) than in LH and LL ewes (146.0 +/- 5.5 and 145.0 +/- 3.0 days, respectively). Bodyweight at birth was higher for LL newborns (4.2 +/- 0.3 kg) than for LH and HH newborns (3.0 +/- 0.5 and 3.2 +/- 0.8 kg, respectively), whereas placental weight was higher in the HH group (396 +/- 80 g) than in the LH (303 +/- 64 g) and LL (280 +/- 40 g) groups. In conclusion, an HA environment modifies fetal growth and pregnancy outcome with the magnitude of effects depending on the time of residence at HA.
V Ctor H Parraguez; Miljenko Atlagich; Rodrigo Díaz; María E Bruzzone; Claus Behn; Luis A Raggi
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Reproduction, fertility, and development     Volume:  17     ISSN:  1031-3613     ISO Abbreviation:  Reprod. Fertil. Dev.     Publication Date:  2005  
Date Detail:
Created Date:  2005-05-23     Completed Date:  2006-03-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8907465     Medline TA:  Reprod Fertil Dev     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  497-505     Citation Subset:  IM    
Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, La Granja, Santiago.
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MeSH Terms
Abdomen / embryology,  ultrasonography
Fetal Development*
Gestational Age
Parietal Bone / embryology,  ultrasonography
Sheep / embryology*
Thorax / embryology,  ultrasonography
Ultrasonography, Prenatal / veterinary

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