outbreeding

outbreed

[out-breed]
verb (used with object), outbred, outbreeding.
to breed selected individuals outside the limits of the breed or variety.

Origin:
out- + breed

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World English Dictionary
outbreed (ˌaʊtˈbriːd)
 
vb , -breeds, -breeding, -bred
1.  (intr) anthropol to produce offspring through sexual relations outside a particular family or tribe
2.  to breed (animals that are not closely related) or (of such animals) to be bred
 
out'breeding
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
outbreeding   (out'brē'dĭng)  Pronunciation Key 
The mating or breeding of distantly related or unrelated individuals. Outbreeding often produces offspring of superior quality because it increases homozygosity (the occurrence of two alleles for the same trait at corresponding positions on homologous chromosomes), thereby sharply reducing the risk of deleterious recessive genes being expressed. Crossbreeding is the most common form of outbreeding.
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