Crossbreeding is the mating of individuals of different breeds, varieties or lines. This produces a hybrid; an animal produced by mating of individuals of different varieties or breeds.
This process combines the best of each individual breed’s genes and creates a more «heterozygous» animal. This individual potentially carries two different genes at the same location (locus) on a chromosome. This is expressed by a phenomenon called «Hybrid Vigour» or «Heterosis».