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A Study of the Inheritance of Resistance and Susceptibility to Infectious Abortion

University of Wisconsin

Abstract

The economic aspect of infectious abortion problem becomes evident when it is realized that a large number of milch cows abort each year, resulting in an enormous financial loss to the dairy industry not only of this country but of other countries as well.

Up to the present, no biologic product has been perfected to the point where it can be absolutely relied upon for the prevention of this disease. It is a matter of common knowledge, however, that some families or groups within a species, are highly refractory to a disease common to that species. Algerian sheep, for example, are immune to anthrax, a disease commonly fatal to other breeds of sheep. The Indian breed of cattle (Zebu or Brahman) is highly resistant to Texas or tick fever, a disease of the English breeds of cattle.

It is probable that every animal species may have some strains that are resistant to a particular disease. If such be the case with infectious abortion, an effort to determine whether or not resistance to the abortion disease is transmitted by inheritance to the offspring would not be in vain.