A region on chicken chromosome 2 affects both egg white thinning and egg weight

Genetics Selection Evolution

Johanna Vilkki¹  Asko Mäki-Tanila¹  Anneli Virta¹  Dirk-Jan De Koning²  Maria Tuiskula-Haavisto¹  Mervi Honkatukia¹ 

[1] Animal Production Research, MTT Agrifood Research Finland, 31600 Jokioinen, Finland;Roslin Institute, Roslin, Midlothian EH25 9PS, UK

关键词: QTL mapping;    egg weight;    egg quality;    chromosome 2;    chicken;   

Others  :  1094199
DOI  :  10.1186/1297-9686-37-6-563

 received in 2005-02-28, accepted in 2005-05-02,  发布年份 2005

【 摘 要 】

We describe the results from genetic dissection of a QTL region on chicken chromosome 2, shown to affect egg weight and quality in an earlier genome scan of an F₂ intercross between two divergent egg layer lines. As the 90% confidence intervals for the detected QTL covered tens of centiMorgans, new analyses were needed. The datasets were reanalysed with denser marker intervals to characterise the QTL region. Analysis of a candidate gene from the original QTL region, vimentin, did not support its role in controlling egg white thinning. Even after reanalysis with additional seven markers in the QTL area, the 90% confidence intervals remained large or even increased, suggesting the presence of multiple linked QTL for the traits. A grid search fitting two QTL on chromosome 2 for each trait suggested that there are two distinct QTL areas affecting egg white thinning in both production periods and egg weight in the late production period. The results indicate possible pleiotropic effects of some of the QTL on egg quality and egg weight. However, it was not possible to make a distinction between close linkage versus pleiotropic effects.

【 授权许可】

   
2005 INRA, EDP Sciences