Abstract
We studied the resistance of the red blood cells of 12 healthy domestic animals (horses, cattle, swine. sheep and goats) respectively by the same method and under the same conditions. As examination method we took Hamburger's method in the essential points, modified slightly as conditions demanded. The blood was taken from the jugular vein in all the animals except swine, in which the blood was taken in a slaughter house directly from the aorta (it consists chiefly of arterial blood). We prepared the NaCl-solutions from 0.33 to 0.78% differing by 0.01% respectively with sodium chloride (Merck). The process of our examination is as follows: 5c.c. NaCl-solutions were put into each of the centrifugal tubes pointed at the bottom and two drops of the defibrinated blood which had been kept in an ice-box for one hour beforehand, were put into the NaCl-solution in the tubes with the same pipette and then well mixed and put in an ice-box for three hours. Then the tubes were taken out from the ice-box and all put in the centrifuge for five minutes and the results were read.
1. The results of the foregoing experiments are summarized in the following table:
2. The minimum resistance. The horses show the greatest resistance and resistance decreases in this order catte, swine, sheep and goats. Swine show the greatest individual differences and goats, sheep, cattle and horses less in order. In general the minimum resistance is proportional to the size of the erythroeytes and in inverse ratio to the erythrocyte number.
3. The maximum resistance. The cattle show the greatest resistance and resistance decreases in this order horses, swine, sheep and goats. Goats and sheep show the greatest individual differences and swine, horses and cattle less in order. Generally the maximum resistance is also proportional to the size of the red corpuscles and inversely proportional to the number of the erythrocytes.
4. The resistance-width. On the whole the swine show the greatest and goats and sheep the next and cattle and horses the smallest. On the average the goats show the largest and in the next come swine, sheep and cattle while horses the smallest.
5. In short, in the resistance of erythrocytes, cattle and horses rank first showing hardly any difference, swine are intermediate while sheep and goats show the least resistance.
