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Physiological Responses to Insulin-Induced Stress in Osteodystrophic Dwarf, Dwarf Carrier and Normal Beef Cattle

Texas Agricultural Experiment Station,¹ College Station

Abstract

In a series of experiments the effect of insulin on levels of the blood glucose and certain plasma-free amino acids of dwarf and normal animals failed to result in a differential response in these animals.

In two studies of insulin-induced stress involving 8 dwarf, 20 dwarf carrier and 22 presumably normal cows, an apparent differential response was observed when considering the change in the total number of neutrophiles from zero to 2 hours after the insulin injection, the greater increase being in the dwarf and carrier animals.

These data suggest a physiological difference between the groups of animals. However, the differences observed in the present studies cannot be considered as a basis for a test for the dwarf gene until verified by other experimentation.

¹ Departments of Biochemistry and Nutrition and of Animal Husbandry, College Station. The research was carried out under Cooperative Agreement with the Animal Husbandry Research Division, Agricultural Research Service, U. S. Department of Agriculture, and as a part of the Regional Beef Cattle Breeding Project S-10.

Appreciation is expressed to Dr. W. C. Banks, Prof. J. K. Riggs and Mr. Harold Franke for their assistance in various phases of the study. The crystalline insulin used in these studies was kindly provided by the Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana, through Dr. J. F. Downing.