Document Detail

Genetic variation in body temperature and its response to short-term acute heat stress in broilers.
MedLine Citation:
PMID:  7724445     Owner:  NLM     Status:  MEDLINE    
Genetic variation in body temperature of broilers and its response to short-term acute (43.5 C for 45 min) heat stress was studied. Body temperatures before (T0) and after (T45) heat exposure were recorded and the changes in body temperature (T delta) were calculated for 5-wk-old chicks from 32 broiler sire families. The T0 data were utilized to rank the families as to their relative body temperature and used to conduct a one-generation divergent family selection program for high basal body temperature (H-BT) and low basal body temperature (L-BT). A control (C) line was established by random selection from the nonselected birds. There was little genetic variation in the base broiler population for body temperature, and one generation of selection for divergence in T0 did not result in differences. There were also no differences among lines in T45. Low realized heritability estimates of .09 and .17 were obtained for T0 in the L-BT and H-BT lines. Phenotypic correlations between body temperature and body weight were very low for all groups. Highly significant negative correlations were observed between T0 and T delta after heat exposure. The T0 fluctuated during the course of each day and between days. The adjustment of the data to eliminate this variation did not result in increased heritability estimates.
E el-Gendy; K W Washburn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Poultry science     Volume:  74     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-05-25     Completed Date:  1995-05-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  225-30     Citation Subset:  IM    
Department of Poultry Science, University of Georgia, Athens 30602-2772, USA.
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MeSH Terms
Body Temperature / genetics*,  physiology
Body Weight
Chickens / genetics,  physiology*
Genetic Variation*
Hot Temperature / adverse effects*
Sex Characteristics
Stress, Physiological / physiopathology

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

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