Document Detail

Quantitative analysis of abnormal spontaneous behavior and clinical assessment of the stargazer rat.
MedLine Citation:
PMID:  7650898     Owner:  NLM     Status:  MEDLINE    
A new mutant derived from the Zucker rat strain called stargazer (homozygous stg/stg) displays abnormal behavior that is characterized by pronounced arching of the neck ("stargazing"), rapid circling, and conspicuous hyperactivity. Results of serologic assays performed by two independent diagnostic laboratories have indicated that the abnormal behavior in the stargazer is not the result of a viral or bacterial infection. In this report, different groups of stargazer rats and their normal-behaving littermates (heterozygous stg/+) were assessed with regard to spontaneous behaviors, heart rate, blood pressure, and plasma biochemical profiles. Besides frequent stargazing, the predominant behavioral feature of the stargazers was extreme hyperactivity; they had sevenfold greater activity than the normal littermates (P < 0.05), expressed in the form of rapid ambulation and tail-chasing. The stargazers had significantly greater daily calorie and water consumption, despite being significantly smaller in body weight than the littermates (P < 0.05 for all). However, urine output was not different between the two groups. Heart rate and blood pressure also were not different. Stargazers had significantly lower total triglycerides concentration and lower aminotransferase activity than littermates (P < 0.05 for both), a finding probably related to their smaller body size. It is concluded that stargazer rats are extremely hyperactive but normotensive; heterozygous littermates are behaviorally normal, despite being carriers of the stg gene; and routine diagnostic blood testing revealed no important differences between the stargazers and their unaffected littermates.
J W Brock; G E Truett; K D Ross; C A Kloster
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Laboratory animal science     Volume:  45     ISSN:  0023-6764     ISO Abbreviation:  Lab. Anim. Sci.     Publication Date:  1995 Jun 
Date Detail:
Created Date:  1995-09-27     Completed Date:  1995-09-27     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  1266503     Medline TA:  Lab Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  276-80     Citation Subset:  IM    
Development Research Center, University of North Carolina at Chapel Hill 27599, USA.
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MeSH Terms
Behavior, Animal*
Blood Chemical Analysis / veterinary
Blood Pressure
Genes, Recessive
Heart Rate
Motor Activity
Rats, Mutant Strains / physiology*,  psychology
Rats, Zucker

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