| Inbreeding | Outbreeding |
| Inbreeding is the production of offspring from the breeding of organisms that are closely related genetically. | Outbreeding is the production of offspring from the breeding of organisms that are genetically unrelated. |
| Parents used for inbreeding are the same breed for 4-6 generations. | Parents used for outbreeding should not be the common ancestor for 4-6 generations. |
| Mating occurs between individuals of the same species in inbreeding. | Mating occurs between separate species, genera, breeds or varieties. |
| Inbreeding typically reduces the vigour of the offspring. | Outbreeding increase the vigour of the offspring. |
