Grow fast, die young

 作者:浦车迮     |      日期:2019-03-07 06:12:01
By Claire Ainsworth TRYING to grow bigger farm animals by genetically engineering them to produce more growth hormone may be harder than we thought, say researchers in Canada. Animals that have been bred to grow fast have hit a metabolic glass ceiling, and any attempts to boost their growth further might only result in physical deformities, they say. Robert Devlin of Fisheries and Oceans Canada in West Vancouver and his colleagues wanted to find out whether domestication affected an animal’s response to being genetically modified in this way. They decided to study fish,