London, November 5: A new study suggests that super-productive modern chickens have, on average, lost over half the genes present in ancestral populations.
Bill Muir of Purdue University in West Lafayette, Indiana, even says that some modern chickens have lost 90 per cent of the genes that were present in ancestral populations.
The researcher said that the new findings indicated that chickens these days lack those characteristics that evolved when they lived in the wild, and might be useful again to help them face stress and disease as livestock.
Inbreeding is a concern with chickens, as the industry is dominated by a few big corporations that produce billions of birds from a handful of private breeding lines.