Verb
To breed in and in. See under Breed, v. i.
Source: Webster's dictionaryThe issue of casual breeders who inbreed irresponsibly is discussed in the following quotation on cattle: Meanwhile, milk production per cow per lactation increased from 17,444 lbs to 25,013 lbs from 1978 to 1998 for the Holstein breed. Source: Internet
This would explain why western, generally more educated countries, inbreed far less than in the developing world. Source: Internet