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Use of Hematological Techniques in Study of "Snorter" Dwarfism^{1, 2,}

Iowa State University, Ames

Abstract

Red cell counts, percent hemoglobin, hematocrit, red cell fragility, white cell counts and differential white cell counts were studied in 118 Hereford cattle of the homozygous normal and heterozygous genotypes with reference to the "snorter" dwarf gene. The effects of age, sex, atmospheric temperature, adrenalin and hemorrhage on these blood characteristics were studied in the two genotypes. Individual variation was so great for each of these characteristics of the blood that none of them offered a satisfactory means of discriminating between genotypes of individual animals, although significant differences between the means of genotypes were found in several instances.

¹ Journal Paper No. J.4024 of the Iowa Agricultural and Home Economics Experiment Station in cooperation with North Central Regional Project NC-1, The Improvement of Beef Cattle Through Breeding Methods. Project No. 1055.

² Financial support for these studies is acknowledged from the American Hereford Association and the American Angus Association.

³ Present address, Animal Husbandry Department, Louisiana State University, Baton Rouge, Louisiana.