Section: Animal Science
Topic: Agricultural sciences, Genetics/genomics

Genetic background of body reserves in laying hens through backfat thickness phenotyping

10.24072/pcjournal.412 - Peer Community Journal, Volume 4 (2024), article no. e41.

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In this study, we pursued three primary objectives: firstly to test and validate the phenotyping of backfat thickness as an indicator of the overall fatness of laying hens; secondly, to estimate genetic parameters for this trait; thirdly, to study the phenotypic and genetic relationships between this trait and other traits related to production and body composition. To address these questions, hens from two lines under divergent selection for residual feed intake, were phenotyped for body weight, body composition traits (backfat, total fat volume, and blood adipokines levels), and egg number. Linear mixed models enabled to estimate variance components and calculate genetic parameters. The two lines largely differed in body fatness: the efficient line had larger backfat and lower chemerin levels compared to the inefficient line. However, there were no significantly differences between the two lines concerning body weight, total fat volume, other blood adipokines levels (adiponectin, ghrelin, and visfatin), and egg production. The genetic parameter estimation revealed moderate heritability (0.38 and 0.42) for backfat and body weight, high heritability (higher than 0.80) for blood adipokines levels and low heritability (0.24 and 0.27) for egg production and total fat volume. The backfat and total fat volume were genetically highly and positively correlated (0.91). The body weight and total fat volume were also highly positively correlated (0.67). However, backfat and body weight were moderately positively correlated (0.39). The genetic correlation between backfat and egg number was moderate and negative. In conclusion, backfat could provide additional genetic information to that of the body weight as a selection criterion for body reserves. However, its correlation with laying performance should be taken into account to avoid undesired responses to selection

Published online:
DOI: 10.24072/pcjournal.412
Type: Research article
Keywords: Body composition, Body reserves, Backfat thickness, Ultrasonography, CT-scan, Adipokines, Genetic correlations, Heritability, Laying hens

Bédère, Nicolas 1; Dupont, Joëlle 2; Baumard, Yannick 3; Staub, Christophe 4; Gourichon, David 3; Frédéric, Elleboudt 5; Le Roy, Pascale 1; Zerjal, Tatiana 6

1 PEGASE, INRAE, Institut Agro, 35590, Saint Gilles, France
2 CNRS, IFCE, INRAE, Université de Tours, PRC, 37380, Nouzilly, France
3 INRAE, PEAT, 37380, Nouzilly, France
4 INRAE, PAO, 37380, Nouzilly, France
5 INRAE, Université de Tours, CHU de Tours, Plate-forme PIXANIM, Nouzilly, France
6 Université Paris-Saclay, INRAE, AgroParisTech, GABI, 78350, Jouy-en-Josas, France
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
     author = {B\'ed\`ere, Nicolas and Dupont, Jo\"elle and Baumard, Yannick and Staub, Christophe and Gourichon, David and Fr\'ed\'eric, Elleboudt and Le Roy, Pascale and Zerjal, Tatiana},
     title = {Genetic background of body reserves in laying hens through backfat thickness phenotyping},
     journal = {Peer Community Journal},
     eid = {e41},
     publisher = {Peer Community In},
     volume = {4},
     year = {2024},
     doi = {10.24072/pcjournal.412},
     language = {en},
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AU  - Gourichon, David
AU  - Frédéric, Elleboudt
AU  - Le Roy, Pascale
AU  - Zerjal, Tatiana
TI  - Genetic background of body reserves in laying hens through backfat thickness phenotyping
JO  - Peer Community Journal
PY  - 2024
VL  - 4
PB  - Peer Community In
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DO  - 10.24072/pcjournal.412
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%A Bédère, Nicolas
%A Dupont, Joëlle
%A Baumard, Yannick
%A Staub, Christophe
%A Gourichon, David
%A Frédéric, Elleboudt
%A Le Roy, Pascale
%A Zerjal, Tatiana
%T Genetic background of body reserves in laying hens through backfat thickness phenotyping
%J Peer Community Journal
%D 2024
%V 4
%I Peer Community In
%R 10.24072/pcjournal.412
%G en
%F 10_24072_pcjournal_412
Bédère, Nicolas; Dupont, Joëlle; Baumard, Yannick; Staub, Christophe; Gourichon, David; Frédéric, Elleboudt; Le Roy, Pascale; Zerjal, Tatiana. Genetic background of body reserves in laying hens through backfat thickness phenotyping. Peer Community Journal, Volume 4 (2024), article  no. e41. doi : 10.24072/pcjournal.412.

PCI peer reviews and recommendation, and links to data, scripts, code and supplementary information: 10.24072/pci.animsci.100233

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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