Biologist William Muir studied chickens. He was interested in productivity, so he looked at what chickens laid more eggs. Chickens live in groups, so he took, from an average group of chickens, only the most productive – you could call them super-chickens – for a super-flock, and each generation, he selected only the most productive for breeding.
After six generations the first group, the average group, was doing just fine. They were plump and fully feathered and egg production had increased dramatically. In the second group, all but three were dead. They’d pecked the rest to death. (more…)