Document Detail


Heritabilities of and genetic relationships between salmonella resistance traits in broilers.
MedLine Citation:
PMID:  10985401     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Using experimental infections, three traits for salmonella resistance were studied: mortality, survival time (in animals that died by infection), and quantitative cecal salmonella carriage at the end of the rearing period (in animals that did not die). In total, 548 animals were used; mortality was 29.2%, mean survival time was 5.97 d (n = 160), and the mean 10log of colony forming units per gram of cecal contents was 1.62 (n = 387). Genetic parameters were evaluated in bivariate threshold-linear models to account for the selective measurement of survival time and cecal carriage. Heritabilities were .06 for survival time, .09 for cecal carriage, and .12 for mortality. The genetic correlation between mortality and cecal carriage was weak (.26), which suggests that these traits are largely controlled by different genes. The genetic correlation between mortality and survival time was relatively strong (-.68). Simultaneous study of multiple traits seems to be of particular importance in judging epidemiological consequences of a possible selection for resistance. Results here indicate that selection on decreased mortality could be unfavorable for the spread of salmonella because the resulting correlated increase in survival time, implying longer shedding by infected animals, is relatively stronger than the correlated decrease in level of cecal carriage. Selection to reduce the level of cecal salmonella carriage could be done while keeping survival time constant, if so desired, because the correlation between these traits is weak (-.15).
Authors:
L L Janss; N M Bolder
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  78     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2000-12-19     Completed Date:  2000-12-19     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2287-91     Citation Subset:  IM    
Affiliation:
ID-LELYSTAD Institute for Animal Science and Health, Lelystad, The Netherlands. L.L.G.Janss@id.wag-ur.nl
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MeSH Terms
Descriptor/Qualifier:
Animals
Cecum / microbiology
Chickens / genetics*,  immunology
Female
Immunity, Innate / genetics
Male
Poultry Diseases / immunology*
Salmonella Infections, Animal / immunology*
Time Factors

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