Change search
ReferencesLink to record
Permanent link

Direct link
The genetic basis of a domestication trait in the chicken: mapping quantitative trait loci for plumage colour
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology. (AVIAN Behavioural Genomics and Physiology group)
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

Domestication is the process by which animals become adapted to the environment provided by humans. The process of domestication has let to a number of correlated behavioural, morphological and physiological changes among many domesticated animal species. An example is the changes of plumage colour in the chicken. Plumage colour is one of the most readily observable traits that make distinction between breeds as well as between strains within a breed. Understanding the genetic architecture of pigmentation traits or indeed any trait is always a great challenge in evolutionary biology. The main aim of this study was to map quantitative trait loci (QTLs) affecting the red and metallic green coloration in the chicken plumage. In this study, a total of 572 F8 intercross chickens between Red Junglefowl and White Leghorn were used. Phenotypic measurements were done using a combination of digital photography and photography manipulating software. Moreover, all birds were genotyped with 657 molecular markers, covering 30 autosomes. The total map distance covered was 11228 cM and the average interval distance was 17 cM. In this analysis, a total of six QTLs (4 for red and 2 for metallic green colour) were detected on four different chromosomes: 2, 3 11 and 14. For red colour, the most significant QTL was detected on chromosome 2 at 165 cM. An additional QTL was also detected on the same chromosome at 540 cM. Two more QTLs were detected on chromosomes 11 and 14 at 24 and 203 cM respectively. Additionally, two epistatic pairs of QTLs were also detected. The identified four QTLs together can explain approximately 36% of the phenotypic variance in this trait. In addition, for metallic green colour, one significant and one suggestive QTLs were detected on chromosomes 2 and 3 at 399 and 247 cM respectively. Moreover, significant epistatic interactions between these two QTLs were detected. Furthermore, these two QTLs together can explain approximately 24% of the phenotypic variance in this trait. These findings suggest that the expression of pigmentation in the chicken plumage is highly influenced by both the epistatic actions and pleiotropic effects of different QTLs located on different chromosomes.

Place, publisher, year, edition, pages
2012. , 31 p.
Keyword [en]
qtl, quantitative trait loci, genome scan, qtl analysis, plumage colour, domestication trait, chicken, pigmentation trait
National Category
Behavioral Sciences Biology Biological Sciences
URN: urn:nbn:se:liu:diva-78393ISRN: LITH-IFM-A-Ex--2626:SEOAI: diva2:532448
Subject / course
2012-05-25, Planck, Linköpings universitet, SE-58183 Linköping, Sweden, Linköping, 14:30 (English)
Agriculture, Veterinary Medicine, Forestry
Available from: 2012-06-11 Created: 2012-06-11 Last updated: 2012-06-11Bibliographically approved

Open Access in DiVA

fulltext(999 kB)792 downloads
File information
File name FULLTEXT01.pdfFile size 999 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
BiologyThe Institute of Technology
Behavioral Sciences BiologyBiological Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 792 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 179 hits
ReferencesLink to record
Permanent link

Direct link