Inbreeding- The mating of individuals who are more closely related than the average individuals in a population. Inbreeding increases homozygosity in the population but it does not change gene frequency.
Two forms of inbreeding:
intensive inbreeding- the mating of closely related animals whose ancestors have been inbred for several generations
linebreeding- a mild form of inbreeding where inbreeding is kept relatively low while a high genetic relationship to an ancestor or a line of ancestors is maintained.