Document Detail

Thermoregulatory development in pups of the subterranean rodent Ctenomys talarum.
MedLine Citation:
PMID:  12834805     Owner:  NLM     Status:  MEDLINE    
The effect of the mother's contact and huddling with nest mates on the mass-specific metabolic rate (RMR) and body temperature (T(b)) of pups of Ctenomys talarum from 2 to 45 days of age was evaluated at ambient temperatures (T(a)) within and below the adult thermoneutrality range (25 and 19 degrees C, respectively, the latter corresponding to the one recorded in burrows during the spring, when pups are born). Under these conditions, we recorded the percentage of time that pups spent huddled with nest mates, with their mother and suckling. At 19 degrees C, huddling and contact with the mother significantly reduced pups' body heat loss until they were 15 days old but did not affect their RMR. Fifteen-day-old pups showed an increase in their RMR, associated with the onset of independent thermoregulation. Pups older than 15 days showed a less variable T(b) and their RMR decreased. 2- to 30-day-old pups spent 80% of the time in contact with their mother and, when she was absent, they spent 70% of the time huddled with their nest mates. However, these results did not differ between the two T(a) evaluated. Forty-five-day-old pups reached adult T(b) and spent significantly less time in contact with their mother and nest mates. Huddling did not have a significant effect on energy expenditure of young tuco-tucos, being this related to the stable thermal conditions found in natural burrows and pups' mode of development.
Ana Paula Cutrera; C Daniel Antinuchi; Cristina Busch
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Physiology & behavior     Volume:  79     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-07-01     Completed Date:  2003-10-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  321-30     Citation Subset:  IM    
Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, C.C. 1245 (7600), Mar del Plata, Argentina.
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MeSH Terms
Animals, Newborn / anatomy & histology,  growth & development,  physiology*
Behavior, Animal
Body Temperature
Body Temperature Regulation*
Body Weight
Cold Temperature
Energy Metabolism
Litter Size
Maternal Behavior
Rodentia / anatomy & histology,  growth & development,  physiology*
Sex Ratio

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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