Document Detail


Effects of age, light regimes and food removal on development of daily rhythmicity in chick heart rate.
MedLine Citation:
PMID:  674014     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Development of daily rhythms in the chick heart rate was investigated during the post-hatching period. The measurements were made in free-moving chicks at one-hour intervals under different light conditions. Clear daily rhythms were seen 3 days after hatching under LD (12:12 hr.) whereas no daily rhythm was observed under either constant illumination or constant dark. The present study demonstrated that while heart rate increased with age during the post-hatching period, the light-time heart rate increased more rapidly than the dark-time heart rate. It was also found that the daily rhythms in heart rate were not formed after food removal even under LD. These results indicate that the light and feeding play an important role in the development of the daily rhythms in chick heart rate.
Authors:
K Shimada; H Koide
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Poultry science     Volume:  57     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  1978 Jan 
Date Detail:
Created Date:  1978-09-29     Completed Date:  1978-09-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  271-6     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Chickens / physiology*
Circadian Rhythm
Darkness
Food Deprivation*
Heart Rate*
Light*

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


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