What does outbreeding mean?
Outbreeding is the mating of individuals from different populations, breeds, or genetic lines. In evolutionary biology and genetics, it can increase genetic diversity and help prevent the accumulation of harmful recessive traits associated with inbreeding. In agriculture and animal husbandry, the term may describe breeding programmes that introduce animals or genetic material from outside a particular line. Outbreeding is not always beneficial: when the populations involved are genetically very different, offspring may have lower fertility or survival, a condition known as outbreeding depression. The word is therefore mainly technical, appearing in discussions of conservation, selective breeding, population genetics, and the management of domestic species.
nounThe practice or process of mating individuals from different populations, breeds, or genetic lines. In genetics and evolutionary biology, it generally increases genetic variation and is the opposite of inbreeding.
- The process of mating individuals from different populations, breeds, or genetic lines.
- The deliberate introduction of genetic material from outside a particular population or breeding line.
"The breeding program used outbreeding to introduce desirable traits into the population."
"Outbreeding can increase genetic diversity within a population."
"The researchers observed reduced fitness in the offspring, a phenomenon known as outbreeding depression."
Plural is uncommon; the uncountable form is preferred in most general writing.
"The study compared outbreedings between several isolated populations."
Outbreeding is nature's way of mixing the gene pool—and it can expose offspring to hidden genetic incompatibilities.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does outbreeding come from?
The word was formed in English by combining the prefix out- with breeding, meaning the reproduction or crossing of organisms. Its basic sense is the opposite of inbreeding, in which individuals from the same population or line mate. It developed as a technical term in genetics and biology, where the related term crossbreeding has a similarly long-established use.
Related word forms
How outbreeding is actually used
Primarily used in biology, genetics, agriculture, and animal husbandry. It is more technical than the general term crossbreeding and specifically contrasts with inbreeding.
Easily confused with outbreeding
Outbreeding involves mating individuals from different populations or genetic lines, whereas inbreeding involves mating individuals from the same population or line.
Crossbreeding usually refers specifically to crossing distinct breeds, while outbreeding is broader and can also involve wild populations or genetically distinct groups.