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Genetic evaluation for latent variables derived from factor analysis in broilers.

J T Paiva1, H R Oliveira2, M Nascimento3

  • 1Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Brazil.

British Poultry Science
|October 24, 2019
PubMed
Summary
This summary is machine-generated.

Factor analysis identified key traits in broilers, simplifying genetic evaluations. This approach can improve breeding programs by focusing on underlying biological factors for weight, tenderness, color, and viscera.

Keywords:
Correlation matrixgenetic parametersmultivariate analysisphenotypesselection

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Area of Science:

  • Animal Genetics
  • Quantitative Genetics
  • Poultry Science

Background:

  • Genetic evaluations in broilers typically involve numerous traits.
  • Identifying key underlying factors can streamline breeding programs.
  • Factor analysis offers a method to reduce trait dimensionality.

Purpose of the Study:

  • To investigate associations between broiler carcass, performance, and meat quality traits.
  • To utilize latent variables (factors) as pseudo-phenotypes for genetic evaluations.
  • To explore the potential of factor analysis in broiler breeding.

Main Methods:

  • Principal components method and varimax rotation for factor extraction.
  • Bayesian inference under a multiple-trait animal model for genetic parameter estimation.
  • Identification of four major biological factors: 'weight', 'tenderness', 'colour', and 'viscera'.

Main Results:

  • The four factors explained 71% of the total variance in the studied traits.
  • 'Weight' factor correlated with body and carcass weights.
  • 'Tenderness' factor related to water-holding capacity and shear force.
  • 'Colour' factor associated with meat color traits.
  • 'Viscera' factor linked to heart, liver, and abdominal fat.
  • Factors exhibited moderate to high heritability (0.35–0.75).

Conclusions:

  • Factor analysis effectively reduces the number of traits for genetic evaluation in broilers.
  • Latent variables derived from factor analysis can serve as valuable pseudo-phenotypes.
  • The identified factors possess sufficient heritability for genetic gain, suggesting potential for improved broiler breeding.