Genetically Engineering Sheep for Larger, Stronger Hindquarters
baldingbobo writes "Duke and Agriculture department scientists are reporting that they have discovered an elusive, mutated gene that causes certain sheep to have unusually big and muscular bottoms. The discovery is especially exciting, said the researchers, because the unusual gene has evaded all the traditional means of detection for nearly a decade. They've been searching for this advance for nearly a decade.There are photos available as well."
Muscle cells are usually not destroyed during exertion - they are damaged, and rebuilt, larger than before. They can be destroyed under too heavy of stress, but they are not replaced.