Domestic chickens primarily descend from Red junglefowl, but their genomes also contain contributions from Grey, Ceylon, and Green junglefowl through introgression. The extent of introgression varies geographically, suggesting chickens acquired these genetic additions during their dispersal across the globe after domestication.

Olivier Hanotte's poultry research program is supported by the CGIAR - Livestock CRP and the Centre for Tropical Livestock Genetics and Health (CTLGH), which may have an interest in the genetic diversity and breeding of chickens. However, there is no indication that this funding influenced the design, conduct, or interpretation of the study.

This study represents a comprehensive genomic analysis of the evolutionary history of domestic chickens, including introgression from wild junglefowl species. The use of whole-genome sequencing and multiple analytical approaches strengthens the findings. While some limitations exist regarding sampling and the interpretation of introgression patterns, the study's strengths outweigh its weaknesses. The findings have important implications for understanding the genetic diversity and adaptation of domestic chickens and could inform future breeding programs.