H. Systems of multiple trait selection 1. Tandem method Select for only one trait at a time in sequence a. Income is dependent on several traits. Very inefficient 2. Independent culling levels Establish minimum standards and select simultaneously, but independently, for each character.
Most people use some variation rather than following strict culling levels.
Cull anything that falls below your standards. Individual can be culled for lacking in only one trait, but be excellent in the other traits. A formula is set up that assigns a weighting factor for each trait being considered in a selection program. All the important traits are combined into one overall value. An index considers the relative economic importance of each trait.