Fat deposition in domesticated chicken has received much attention in modern breeding and poultry production. The aim is for high intramuscular fat (IMF) content for better meat quality and low abdominal fat (AF) for higher feed efficiency. Fatness traits are complex quantitative traits influenced by many variants in the genome some of which are likely to affect gene expression during development. Despite the ever-increasing amount of sequencing data, knowledge of fatness phenotypes and the underlying genes and variants is still limited. In this thesis, a new chicken SNP genotyping array is described based on SNPs segregating in local Chinese breeds and commercial lines. The new array offers potential benefits in breeding programs aimed at increasing both the meat quality and the feed efficiency. Furthermore, I describe the IMF and the AF deposition during development. I explore the transcriptomes of chicken breast muscle, AF, and liver in different stages. More specific,...

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