Reduced-rank estimation of genetic parameters for egg production traits and cluster analyses with predicted breeding values

Freitas, Leandro Alves; Savegnago, Rodrigo Pelicioni; Grupioni, Natália Vinhal; Ramos, Salvador Boccaletti; Stafuzza, Nedenia Bonvino; Figueiredo, E. A. P. de; Schmidt, G. S.; Ledur, Mônica Corrêa; Munari, Danísio Prado

doi:10.1080/09064702.2019.1580308

Cited by 1 publication

(1 citation statement)

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“…EN has been estimated and ranged from 0.10 to 0.32 [ 7 ], suggesting the genetic basis of EN varied considerably among different breeds. de Freitas et al found that the genetic correlation between AFE and total egg production of the D‘D’ layer line was −0.52, while Niknafs et al found that for Mazandaran native chickens, it was only −0.41 [ 8 , 9 ]. These results indicated that there were large differences in the genetic basis for different breeds and genetic parameters were difficult to apply across breeds.…”

Section: Introductionmentioning

confidence: 99%

Genetic Analysis of Egg Production Traits in Luhua Chickens: Insights from a Multi-Trait Animal Model and a Genome-Wide Association Study

Yang,

Lu,

et al. 2024

Genes

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Egg production plays a pivotal role in the economic viability of hens. To analyze the genetic rules of egg production, a total of 3151 Luhua chickens were selected, the egg production traits including egg weight at first laying (Start-EW), egg weight at 43 weeks (EW-43), egg number at 43 weeks (EN-43), and total egg number (EN-All) were recorded. Then, the effects of related factors on egg production traits were explored, using a multi-trait animal model for genetic parameter estimation and a genome-wide association study (GWAS). The results showed that body weight at first egg (BWFE), body weight at 43 weeks (BW-43), age at first egg (AFE), and seasons had significant effects on the egg production traits. Start-EW and EW-43 had moderate heritability of 0.30 and 0.21, while EN-43 and EN-All had low heritability of 0.13 and 0.16, respectively. Start-EW exhibited a robust positive correlation with EW-43, while Start-EW was negatively correlated with EN-43 and EN-All. Furthermore, gene ontology (GO) results indicated that Annexin A2 (ANXA2) and Frizzled family receptor 7 (FZD7) related to EW-43, Cyclin D1 (CCND1) and A2B adenosine receptor (ADORA2B) related to EN-All, and have been found to be mainly involved in metabolism and growth processes, and deserve more attention and further study. This study contributes to accelerating genetic progress in improving low heritability egg production traits in layers, especially in Luhua chickens.

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Section: Introductionmentioning

confidence: 99%