Principles of Genetics and Breeding

13.1.11.3. Selection index

It is the most efficient selective breeding programme that can be used to improve two or more phenotypes. Unfortunately, it is also more sophisticated and more expensive than independent culling. This type of selective breeding programme should only be used by aquaculturists who work at research stations or by hatchery managers who work at fingerling production centers. Farmers and most aquaculturists should use independent culling if they want to improve two phenotypes. A selection index is really only needed if three or more phenotypes will be improved simultaneously.