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Association between ovocalyxin‐32 gene haplotypes and eggshell quality traits in an F 2 intercross between two chicken lines divergently selected for eggshell strength
Author(s) -
Takahashi H.,
Sasaki O.,
Nirasawa K.,
Furukawa T.
Publication year - 2010
Publication title -
animal genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.756
H-Index - 81
eISSN - 1365-2052
pISSN - 0268-9146
DOI - 10.1111/j.1365-2052.2010.02034.x
Subject(s) - haplotype , eggshell , biology , genetics , single nucleotide polymorphism , population , allele , breed , gene , genotype , ecology , demography , sociology
Summary Broken and cracked eggshells contribute significantly to economic losses in the egg production industry. We previously identified ovocalyxin‐32 as a potential gene influencing eggshell traits, by analysing an intercross between two parent lines developed from the same founder population by a two‐way selection for eggshell strength with non‐destructive deformation (DEF) conducted over 14 generations. We determined the nucleotide sequences of six ovocalyxin‐32 exons in the parent individuals and analysed the association between ovocalyxin‐32 and eggshell traits in the F 2 individuals. We identified three haplotypes (W, M and S) of ovocalyxin‐32 in the parent individuals. A mismatch amplification mutation assay was performed to distinguish six diplotype individuals (WW, MM, SS, WM, MS and WS) in the F 2 population. The egg weight (EW) of SS‐diplotype individuals was significantly higher than that of WW‐, WM‐ and WS‐diplotypes. Short length of the egg (SLE) of SS‐diplotype individuals was significantly higher than that of WW‐, WM‐ and MS‐diplotypes. Long length of the egg (LLE) of SS‐diplotype individuals was significantly higher than that of WM‐ and WS‐diplotypes. DEF of WW‐diplotype individuals was significantly higher than that of SS‐, WM, MS and WM‐diplotypes. Haplotypic effect analyses showed significant differences between the W‐haplotype and the S‐haplotypes in the EW, SLE, LLE and DEF. The DEF of M‐haplotype was significantly lower than that of W‐ and S‐haplotypes. These results suggest that S‐ and M‐haplotypes are critical for high quality of eggshells in the F 2 population. In conclusion, ovocalyxin‐32 is a useful marker of eggshell traits and can be used to develop strategies for improving eggshell traits in commercial layer houses.