Abstract
IN the breeding of domestic animals consanguineous
matings are frequently made. Occasionally matings are
made between very close relatives-sire and daughter,
brother and sister, etc.-but as a. rule such close inbreed-
ing is avoided and there is instead an attempt to concen-
trate the blood of some noteworthy individual by what
is known as line breeding. No regular system of mating
such as might be followed with laboratory animals is
practicable as a rule.
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