“…The detection of single nucleotide polymorphisms ( SNPs ) has helped identify novel genetic markers to more precisely select animals for enhanced egg-production performance. The identification of SNPs in candidate genes and the correlation with egg-laying traits in chickens, geese, and ducks is an important technique used to genetically improve animal selection and production ( Kang et al, 2012 ; Li et al, 2013 ; Wu et al, 2014 , 2018 ; Kulibaba, 2015 ; Alsiddig et al, 2017 ; Mohamed et al, 2017 ; Niu et al, 2017 ; Xu et al, 2017 ; Ye et al, 2017 ; Feng et al, 2018 ; Bai et al, 2019 )…”