Serum transferrins were analyzed by polyacrylamide gel electrophoresis in four populations of Colorado bighorn sheep, Ovis canadensis canadensis. Transferrin was found to be polymorphic, with two alleles, Tf D and Tf E, being represented in each of the four populations. Within herds the phenotypic ratios conformed to values predicted by the Hardy–Weinberg equilibrium. Among populations, significant differences were seen with respect to phenotypic frequencies.
Roberts, Patrick W.; Nash, Donald J.; and Keiss, Robert E.
"Transferrin polymorphism in bighorn sheep, Ovis canadensis, in Colorado,"
Great Basin Naturalist: Vol. 40
, Article 9.
Available at: http://scholarsarchive.byu.edu/gbn/vol40/iss2/9