What two types of breeding systems are generally used by individuals in the purebred industry?

The two types of breeding systems typically utilized in the purebred industry are inbreeding and linebreeding. Inbreeding involves mating closely related individuals, which can help to concentrate desirable traits within a lineage. This method can bring forth uniformity in the herd and is often used to establish specific genetic characteristics within a breed.

Linebreeding, a form of inbreeding, involves mating individuals that are less closely related than in traditional inbreeding, but still within the same lineage. This approach aims to maintain the genetic benefits of inbreeding while minimizing potential negative effects associated with too much genetic similarity. Linebreeding can help sustain desirable traits over generations while preserving genetic diversity to some extent.

In contrast, crossbreeding involves mating individuals from different breeds and is often used to enhance hybrid vigor, which is not the main focus in the purebred industry. The other option regarding half breeding and full breeding does not pertain to recognized breeding systems in livestock selection and evaluation. Therefore, inbreeding and linebreeding are the key systems employed to achieve specific breeding goals in purebred livestock.