Wisconsin Dairymen's Association / Fortieth annual report of the Wisconsin Dairymen's Association : held at Beloit, Wis., November, 1911. Report of the proceedings, annual address of the president, and interesting essays and discussions relating to the dairy interests
Hastings, E. G.
Tuberculin and its uses, pp. 97-106 PDF (2.1 MB)
Wisconsin Dairymen's Association. hour. The tuberculin test consists of a comparison of temperatures taken before the injection of the tuberculin with those taken after the injection of tuberculin. We thus obtain an insight into the thermal reaction that has been caused by the tuberculin. Table I. Highest tempera- Highest tempera- ture before inocu- ture after Inocula- Reaction. Result. lation. tion. 102.2 102.6 0.4° Healthy. 101.8 102.8 1.0 Healthy. 102.6 104.2 1.6 Healthy. 102.2 103.4 1.2 Healthy. 101.6 104. 2.4 Healthy. 102.6 103.8 1.2 Healthy. 102.3 104.6 2.3 Diseased. 102.4 104.8 2.4 Diseased. 102.5 103. 0.5 Diseased. 102.0 104.2 2.2 Diseased. 103.6 103.8 0.2 Diseased. 102.0 103.6 1.6 Diseased. 102.0 104. 2.0 Diseased. 102.4 102.8 0.4 Diseased. Various methods of interpreting these temperature records have been proposed. It will be evident to anyone that if too low a standard be taken as indicating a reaction to the tuberculin we will be getting within the limits of variation of temperature of the healthy animal, and if all the animals that react according to this standard are re- moved we will be taking out probably all the diseased animals of the herds and a certain number of healthy animals as well. If a high standard Is adopted we will take out only a portion of the diseased animals, since the variation in temperature of some of the diseased animals will not be sufficient to reach the standard adopted. The difficulty of interpreting temperature records is shown In table I, in which the highest temperature before Injection and also the highest temperature after Injection of a number of cattle is given. This work was carried out on a herd for experimental purposes, and the entire herd was killed and examined carefully after the tests had been made. It will be noted that there are differences between the highest and lowest temperatures in the case of diseased animals that are practically duplicated by variations In the temperatures of healthy animals. For Instance, the last animal given in the table has not reacted to an ex- tent that would condemn her by any method of Interpretation yet proposed; yet she is found diseased on slaughter. Animal No. 5, show- ing a temperature of 104° after inoculation and a reaction of 2.4'. would be condemned by any method of interpreting temperature rec- ords, and yet this animal was found to be healthy on post mortem examination. M l 99
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