Bacon-pigs fed on Indian corn degenerate into lardhogs, run down in size and become too small in the bone and less prolific by inbreeding.
Very few analytic models require that these links be defined as biological links, as is required to legitimately calculate inbreeding coefficients.
Publications: Boakes, E. and Wang, J. (2005) A simulation study on detecting purging in inbreeding depression in captive populations.
Some fishes exhibit a marked disinclination to breed, which may be due to hormone treatments and inbreeding.