Document Detail

Pulmonary maturation in canine foetuses from early pregnancy to parturition.
MedLine Citation:
PMID:  19754553     Owner:  NLM     Status:  In-Process    
Development of the foetal respiratory system includes both pulmonary growth and maturation. In human medicine, a higher incidence of respiratory distress is reported in newborn males. This study aimed to identify different phases of canine foetal lung maturation throughout pregnancy, to determine the stage of pregnancy in which surfactant production begins and to compare pulmonary development of male and female foetuses. Pregnant bitches (34) were subjected to elective ovariohysterectomy and allocated into four groups, according to the stage of pregnancy: 30-40 days of pregnancy (n = 10), 41-50 days (n = 10), 51-60 days (n = 10) and bitches in the first stage of parturition (n = 4). Foetal lungs were histologically processed and evaluated by optical microscopy. The pseudoglandular phase was identified between the 35th day and 46th day of gestation; the onset of canalicular and saccular periods was observed, respectively, from the 48th day and 60th day of pregnancy. Lungs from foetuses at term were in the saccular phase; thus, the development into the alveolar period occurs in the neonatal period. The histological analyses revealed that respiratory tract development is centrifugal, from upper to lower airways. Therefore, it is possible to identify distinct development periods in different portions of the same organ. In conclusion, the saccular phase of lung development begins around 57 and 60 days of pregnancy, the period in which surfactant production is believed to occur. Male and female foetuses present similar pulmonary development from early pregnancy until parturition.
T M Sipriani; F Grandi; L C G da Silva; P C Maiorka; C I Vannucchi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Reproduction in domestic animals = Zuchthygiene     Volume:  44 Suppl 2     ISSN:  1439-0531     ISO Abbreviation:  Reprod. Domest. Anim.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-09-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9015668     Medline TA:  Reprod Domest Anim     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  137-40     Citation Subset:  IM    
Department of Animal Reproduction, Faculty of Veterinary Medicine, University of São Paulo, São Paulo, Brazil.
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