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Mapping of Quantitative Trait Loci Affecting Eggshell Quality in an F_2 Population Derived from Strong and Weak Eggshell Lines of the white leghorn Chicken Breed

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Agricultural Sciences in China 2010年第4期9卷 593-597页

作者： YANG De-ji O Sasaki M Minezawa K Nirasawa H Takahashi Genebank National Institute of Agrobiological Sciences Tsukuba 305-8602 Japan Animal Breeding and Reproduction Research Team National Institute of Livestock and Grassland Science Tsukuba 305-0901 Japan College of Veterinary Science Nanjing Agricultural University Nanjing 210095 P.R.China

Broken and cracked eggshells cause major economic losses to the egg production industry. An F2 population of 262 hens obtained by crossing a strong egg shell line with a weak egg shell line of the white leghorn breed was used for detecting the quantitative trait loci （QTL） affecting eggshell quality. The 2 lines were developed from the same founder population by two-way selection for egg shell strength with nondestructive deformation. Of the 1 014 microsatellite markers tested, 35 were mapped on 10 autosomal linkage groups. There was no informative marker on chromosome Z. The QTLs associated with 7 traits, i.e., body weight, short length of egg, long length of egg, eggshell strength, eggshell thickness （EST）, eggshell weight （ESW）, and egg weight （EW）, were identified. Highly significant （P〈0.01） QTLs associated with EST and ESW and a significant （P〈 0.05） QTL associated with EW were mapped to a region flanking ABR0545 and ABR0362 on chromosome 9. These QTLs are good candidates to be employed in the development of strategies for reducing the number of broken and cracked eggs in commercial layer houses by employing marker assisted selection.

关键词： chicken white leghorn quantitative trait loci eggshell quality

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A microarray study of altered gene expression during melanoblasts migration in normal pigmented white leghorn and hyperpigmented mutant Silky Fowl

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Frontiers of Agricultural Science and Engineering 2014年第4期1卷 299-306页

作者： Yulin LI Deping HAN Junying LI Dawn KOLTES Xuemei DENG Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China Iowa State University AmesIA 50011USA

Melanoblasts originating from neural crest cells can migrate through the mesenchyme of the developed embryo and give rise to *** the melanocytes that are confined to the integument in other vertebrates,melanocytes in Silky Fowl can reach the ventral regions of the embryos owing to differences in gene expression in the process of melanoblasts *** this study,we used microarray profiling to identify differences in gene expression between white leghorn and Silky *** expression of 2517 microarray probes(P2)was observed in Silky Fowl compared to white *** filtration by cluster analysis,functional annotation and pathway analysis,eight differentially expressed genes were identified to be closely related to the development of ***,differences in expression of immune genes were also detected between Silky Fowl and white *** differentially expressed genes associated with melanocyte development were verified by q-PCR,and results were highly consistent with the microarray *** genes with significantly altered expression involved in melanoblast migration and development suggested that different microenvironments resulted in the abnormal melanoblast migration in Silky Fowl,although there were no big differences in melanoblast development between these two *** candidate genes discovered in this study are beneficial to understand the molecular mechanism of hyperpigmentation in Silky Fowl.

关键词： Silky Fowl white leghorn melanoblast migration gene expression

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