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Model comparison to evaluate a shell quality bio-complex in layer hens.

J Arango1, A Wolc2, P Settar3

  • 1Hy-Line International, Dallas Center, IA, USA JArango@hyline.com.

Poultry Science
|September 1, 2016
PubMed
Summary
This summary is machine-generated.

Reducing egg breakage in hens requires improving shell quality. Acoustic egg testing and breaking strength measurements can guide selection for stronger eggshells, indirectly reducing micro-cracks.

Keywords:
egg qualitygenetic parameterslayer henselectionshell quality

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Area of Science:

  • Animal Breeding and Genetics
  • Poultry Science
  • Quantitative Genetics

Background:

  • Eggshell breakage is a significant economic issue in egg layer hens.
  • Traditional measures like breaking strength are correlated with shell thickness but don't capture all quality aspects.
  • Acoustic egg testing offers a novel method to assess dynamic stiffness and detect micro-cracks.

Purpose of the Study:

  • To define and evaluate a shell quality bio-complex for improving eggshell strength in layer hens.
  • To assess the heritability and genetic correlations of different shell quality traits.
  • To determine the optimal selection strategy for reducing egg breakage.

Main Methods:

  • Utilized a large dataset (over 81,000 records) from four generations of three pure lines.
  • Applied linear repeatability and threshold models to analyze breaking strength (equator and poles), dynamic stiffness (KDyn), and micro-crack (MCr) incidence.
  • Implemented AIREMLF90 and THRGIBBS1F90 for genetic parameter estimation.

Main Results:

  • Heritability estimates varied across traits, with dynamic stiffness (KDyn) showing moderate heritability (h² ≈ 0.33-0.36).
  • Micro-crack (MCr) incidence had low heritability (h² ≈ 0.02-0.06) but significant negative genetic correlations with breaking strength and KDyn.
  • Breaking strength at equator (BSe) and poles (BSp) were distinct traits with moderate genetic correlations.

Conclusions:

  • Direct selection for micro-crack reduction is not advisable due to low heritability and negative correlations.
  • Indirect selection for improved shell quality through breaking strength (BSe, BSp) and dynamic stiffness (KDyn) is recommended.
  • A holistic approach to shell quality selection is crucial for effectively reducing egg breakage in layer hens.