J. Anim Sci.
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J. Anim Sci. 1960. 19:948-955.
© 1960 American Society of Animal Science
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Radiographic and Electrocardiographs Studies of the Bovine Heart in Relation to Dwarfism1

C. A. Dinkel2, J. A. Minyard2 and W. L. Jones3

South Dakota Agricultural Experiment Station, Brookings

Abstract

Radiographic and electrocardiographic studies of the bovine heart were conducted in an effort to find a means of separating the normal appearing carrier of the snorter dwarf gene from the homozygous normal animal. Radiographs of the heart were taken on 28 pedigree-clean animals, 6 known heterozygous carriers, and 6 dwarf calves. Twenty of the 28 pedigree-clean calves were correctly classified by the radiographs, 4 of the 6 known carriers were correctly classified, and all 6 of the dwarf calves could be separated on the basis of their radiographs. The results of the electrocardiographic studies did not indicate an accurate means of separating the two genotypes although a highly significant sex-genotype interaction was found for the QRS interval. Although the numbers involved were too small for critical evaluation, it appears that the radiographic and electrocardiographic techniques used were not sufficiently accurate to furnish a practical means of separating the two genotypes.

Footnotes

1 This study was conducted in cooperation with the Animal Husbandry Research Division, A.R.S., U.S.D.A. and the North Central Regional Project NC-1, The Improvement of Beef Cattle Through Breeding Methods. Approved for publication by the Director of the South Dakota Agricultural Experiment Station as Journal Series No. 473.

2 Animal Husbandry Department.

3 Medical School, University of South Dakota.






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Copyright © 1960 by the American Society of Animal Science.