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Evaluation of the Profilometer for Detection of Hereford Bulls Heterozygous for the Snorter Dwarf Gene¹

South Dakota State University, Brookings and and U. S. Department of Agriculture

Abstract

Progeny test results on 40 horned Hereford bulls, on which genotype predictions were made on the basis of median head profile readings, indicated that the profilometer does have predictive value for distinguishing between heterozygous and homozygous normal individuals with respect to the Snorter dwarf gene. The product moment correlation between predicted and actual genotype was 0.36, which is significant (P<.05). However, the accuracy is too low to be useful in identifying genotypes for this condition.

¹ Published with the approval of the Director as Paper No. 647, Journal Series, South Dakota Agricultural Experiment Station. Contribution from North Central Regional Project NC-1, Improvement of Beef Cattle through Breeding Methods.

² Department of Animal Science, South Dakota State University, Brookings.

³ Beef Cattle Research Branch, Animal Husbandry Research Division, Agricultural Research Service, Lincoln, Nebraska.