Date of this Version
Published in Transactions of the Nebraska Academy of Sciences, Volume 2 (1973).
The primary objectives of this study were: (1) to provide quantitative descriptions of the chromosomes of the domestic swine (Sus scrota: 2n=38), the European wild swine (2n=36) and the domestic-European wild hybrid (2n=37); and (2) to define chromosomal differences between the three karyotypes.
The diploid (2n) chromosome number of the domestic swine has been shown to be 38 (Ruddle, 1961; Makina et al., 1962; McConnell et al., 1963). The European wild swine of the Tellico Wildlife Management Area of Tennessee has been shown to have a diploid chromosome number of 36 (Rary et al., 1968). European wild swine with 36 chromosomes crossed with 38 chromosome domestic swine have produced fertile 37 chromosome offspring (UT-AEC, 1967 unpublished data).
McConnell et at., (1963) and Ruddle (1965) have quantitatively analyzed the somatic chromosomes from a small number of cells of the domestic swine (2n=38). McConnell utilized chromosome measurements taken from a total of 21 cells, 13 female and 8 male, from the second passage of pig kidney tissue cultures.
Establishment of a "definition" of a karyotype of a particular species provides a normal or control for such studies as quantitative analysis of chromosome breakage by ionizing radiations and other cytogenetic studies which would directly involve chromosome morphology. Establishment of a "definition" of human karyotype, for example, has proved to be of great value in analysis of many "diseases" and abnormalities that are directly related to chromosome abnormalities (Chu, 1964; Hall, 1964).