# Genetic determinism of abdominal fat tissue and relationships with body weight and egg quality in Rhode Island Red

Nicolas Bedere, David Picard Druet, Frédéric Herault, Florian Herry, Sophie Allais, Amandine Varenne, Thierry Burlot, Pascale Le Roy

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Nicolas Bedere, David Picard Druet, Frédéric Herault, Florian Herry, Sophie Allais, et al.. Genetic determinism of abdominal fat tissue and relationships with body weight and egg quality in Rhode Island Red. XIth European symposium on poultry genetics (ESPG), Oct 2019, Prague, Czech Republic. Guarant International spol. s r.o., 2019, Proceedings of the XIth European symposium on Poultry Genetics. hal-02352490

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Submitted on 6 Nov 2019

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# GENETIC ARCHITECTURE OF ABDOMINAL FAT TISSUE AND RELATIONSHIPS WITH BODY WEIGHT AND EGG QUALITY IN RHODE ISLAND RED

BEDERE N. (1), PICARD DRUET D. (1), HERAULT F. (1), HERRY F. (1, 2), ALLAIS S. (1), VARENNE A. (2), BURLOT T. (2), LE ROY P. (1)

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**Extenting the laying period → trade-off between**
**egg production and safeguarding body reserves in**
**late laying period?**

In aged roosters (80wk), a dichotomic phenotype
has been observed: lean OR fat

What is the genetic architecture of the presence of abdominal fat in aged rooster

How is it related to other selection criteria

<figure><img src="image_3.png" /></figure>

## research Project UTOPIGE (FR)

~9,500 Rhode Island Red layers:

- egg quality

- body weight at 70 wk

...of which 987♂ were also:

- phenotyped for abdominal fat tissue at 90 wk

- genotyped on the 600K Affymetrix® Axiom® HD genotyping array

Variance components: REMLf90

GWAS: MULLER

## Variance components

<table><thead><tr><th></th><th>Abdominal fat ♂</th><th>Body weight ♂</th><th>Body weight ♀</th><th>Egg weight</th><th>Egg Shell Colour</th><th>Egg Shell Strength</th><th>Albumen Height</th></tr></thead><tbody><tr><th>Abdominal fat ♂</th><td>0.20</td><td>0.31</td><td>NA</td><td>NA</td><td>NA</td><td>NA</td><td>NA</td></tr><tr><th>Body weight ♂</th><td>0.21</td><td>0.43</td><td>NA</td><td>NA</td><td>NA</td><td>NA</td><td>NA</td></tr><tr><th>Body weight ♀</th><td>0.10</td><td>0.67</td><td>0.66</td><td>0.20</td><td>0.20</td><td>-0.05</td><td>0.01</td></tr><tr><th>Egg weight</th><td>0.00</td><td>0.38</td><td>0.40</td><td>0.45</td><td>0.04</td><td>0.04</td><td>0.13</td></tr><tr><th>Egg Shell Colour</th><td>0.02</td><td>0.11</td><td>0.39</td><td>0.16</td><td>0.40</td><td>0.09</td><td>0.11</td></tr><tr><th>Egg Shell Strength</th><td>-0.03</td><td>-0.08</td><td>-0.17</td><td>0.00</td><td>-0.02</td><td>0.20</td><td>0.07</td></tr><tr><th>Albumen Height</th><td>-0.05</td><td>-0.05</td><td>0.00</td><td>0.12</td><td>0.08</td><td>0.11</td><td>0.22</td></tr></tbody></table>

## GWAS

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→ **diagonal** = heritability estimates
**upper matrix** = phenotypic correlations
**lower matrix** = genetic correlations

The presence/absence of abdominal fat tissue in aged rooster:

- showed a **moderate heritability** estimate

- **Unsignificant genetic correlations** with egg production and little to moderate ones with BW

→ BW is easier to measure than AFT but **would not be a good predictor of AFT**

→ Further studies undergoing for high-throughput phenotyping in females

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INRA
SCIENCE & IMPACT

AGRO
CAMPUS
OUEST

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NOVOGEN
Prima dyon de la vie

1. PEGASE, INRA, AGROCAMPUS OUEST, 35590, Saint-Gilles, France

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