Outcrossing or outbreeding is the practice of introducing unrelated genetic material into a breeding line. It increases genetic diversity, thus reducing the probability of an individual being subject to disease or reducing genetic abnormalities. It is also known as a Patrilineal system. It is used in line-breeding to restore vigor or size and fert...
The mating of unrelated individuals of the same breed.
Mating of individuals that are less closely related than the average of the breed. Commercial breeders and some purebred breeders should be outcrossing by periodically adding new sires that are unrelated to their cow herd. This outcrossing should reduce the possibility of loss of vigor due to inbreeding. 
mating two individuals of the same breed that are sufficiently unrelated that the IC of the progeny is lower than the average of the parents.
is the breeding of two rabbits from unrelated lines.
The mating of unrelated individuals of the same breed.
the breeding of two individuals with no common ancestors within a five generation pedigree Pedigree
mating unrelated parents