Ghent University Academic Bibliography

Advanced

Fluctuating asymmetry in broiler chickens: a decision protocol for trait selection in seven measuring methods

Annelies Van Nuffel, Frank Tuyttens UGent, S Van Dongen, W Talloen, Els Van Poucke, B Sonck and Luc Lens UGent (2007) POULTRY SCIENCE. 86(12). p.2555-2568
abstract
Nonidentical development of bilateral traits due to disturbing genetic or developmental factors is called fluctuating asymmetry (FA) if such deviations are continuously distributed. Fluctuating asymmetry is believed to be a reliable indicator of the fitness and welfare of an animal. Despite an increasing body of research, the link between FA and animal performance or welfare is reported to be inconsistent, possibly, among other reasons, due to inaccurate measuring protocols or incorrect statistical analyses. This paper reviews problems of interpreting FA results in poultry and provides guidelines for the measurement and analysis of FA, applied to broilers. A wide range of morphological traits were measured by 7 different techniques (ranging from measurements on living broilers or intact carcasses to X-rays, bones, and digital images) and evaluated for their applicability to estimate FA. Following 4 selection criteria (significant FA, absence of directional asymmetry or antisymmetry, absence of between-trait correlation in signed FA values, and high signal-to-noise ratio), from 3 to 14 measurements per method were found suitable for estimating the degree of FA. The accuracy of FA estimates was positively related to the complexity and time investment of the measuring method. In addition, our study clearly shows the importance of securing adequate statistical power when designing FA studies. Repeatability analyses of FA estimates indicated the need for larger sample sizes, more repeated measurements, or both, than are commonly used in FA studies.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
directional asymmetry, developmental instability, measurement error, statistical power, trait selection, ORGANISM-WIDE ASYMMETRY, DEVELOPMENTAL INSTABILITY, BILATERAL ASYMMETRY, DIRECTIONAL ASYMMETRY, ANIMAL-WELFARE, GALLUS-GALLUS, STABILITY, STRESS, INDICATOR, SIZE
journal title
POULTRY SCIENCE
Poult. Sci.
volume
86
issue
12
pages
2555 - 2568
Web of Science type
Article
Web of Science id
000251396500011
JCR category
AGRICULTURE, DAIRY & ANIMAL SCIENCE
JCR impact factor
1.603 (2007)
JCR rank
7/43 (2007)
JCR quartile
1 (2007)
ISSN
0032-5791
DOI
10.3382/ps.2006-00192
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
410488
handle
http://hdl.handle.net/1854/LU-410488
date created
2008-05-17 08:44:00
date last changed
2015-01-09 09:12:30
@article{410488,
  abstract     = {Nonidentical development of bilateral traits due to disturbing genetic or developmental factors is called fluctuating asymmetry (FA) if such deviations are continuously distributed. Fluctuating asymmetry is believed to be a reliable indicator of the fitness and welfare of an animal. Despite an increasing body of research, the link between FA and animal performance or welfare is reported to be inconsistent, possibly, among other reasons, due to inaccurate measuring protocols or incorrect statistical analyses. This paper reviews problems of interpreting FA results in poultry and provides guidelines for the measurement and analysis of FA, applied to broilers. A wide range of morphological traits were measured by 7 different techniques (ranging from measurements on living broilers or intact carcasses to X-rays, bones, and digital images) and evaluated for their applicability to estimate FA. Following 4 selection criteria (significant FA, absence of directional asymmetry or antisymmetry, absence of between-trait correlation in signed FA values, and high signal-to-noise ratio), from 3 to 14 measurements per method were found suitable for estimating the degree of FA. The accuracy of FA estimates was positively related to the complexity and time investment of the measuring method. In addition, our study clearly shows the importance of securing adequate statistical power when designing FA studies. Repeatability analyses of FA estimates indicated the need for larger sample sizes, more repeated measurements, or both, than are commonly used in FA studies.},
  author       = {Van Nuffel, Annelies and Tuyttens, Frank and Van Dongen, S and Talloen, W and Van Poucke, Els and Sonck, B and Lens, Luc},
  issn         = {0032-5791},
  journal      = {POULTRY SCIENCE},
  keyword      = {directional asymmetry,developmental instability,measurement error,statistical power,trait selection,ORGANISM-WIDE ASYMMETRY,DEVELOPMENTAL INSTABILITY,BILATERAL ASYMMETRY,DIRECTIONAL ASYMMETRY,ANIMAL-WELFARE,GALLUS-GALLUS,STABILITY,STRESS,INDICATOR,SIZE},
  language     = {eng},
  number       = {12},
  pages        = {2555--2568},
  title        = {Fluctuating asymmetry in broiler chickens: a decision protocol for trait selection in seven measuring methods},
  url          = {http://dx.doi.org/10.3382/ps.2006-00192},
  volume       = {86},
  year         = {2007},
}

Chicago
Van Nuffel, Annelies, Frank Tuyttens, S Van Dongen, W Talloen, Els Van Poucke, B Sonck, and Luc Lens. 2007. “Fluctuating Asymmetry in Broiler Chickens: a Decision Protocol for Trait Selection in Seven Measuring Methods.” Poultry Science 86 (12): 2555–2568.
APA
Van Nuffel, Annelies, Tuyttens, F., Van Dongen, S., Talloen, W., Van Poucke, E., Sonck, B., & Lens, L. (2007). Fluctuating asymmetry in broiler chickens: a decision protocol for trait selection in seven measuring methods. POULTRY SCIENCE, 86(12), 2555–2568.
Vancouver
1.
Van Nuffel A, Tuyttens F, Van Dongen S, Talloen W, Van Poucke E, Sonck B, et al. Fluctuating asymmetry in broiler chickens: a decision protocol for trait selection in seven measuring methods. POULTRY SCIENCE. 2007;86(12):2555–68.
MLA
Van Nuffel, Annelies, Frank Tuyttens, S Van Dongen, et al. “Fluctuating Asymmetry in Broiler Chickens: a Decision Protocol for Trait Selection in Seven Measuring Methods.” POULTRY SCIENCE 86.12 (2007): 2555–2568. Print.