One of the principal functions of purebred breeders is to serve as a source of seedstock for the commercial producer. A crossbred female is bred to a male of a third breed or is bred back to the breed of sire that is present in her genetic make-up in the lowest percentage. None are kept for breeding purposes. 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.