قراءة كتاب Contagious Abortion of Cows

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Contagious Abortion of Cows

Contagious Abortion of Cows

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دار النشر: Project Gutenberg
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should be sent to a bull on a clean establishment.

Destruction of Virulent Material and disinfection of everything contaminated by it.—The immediate disinfection of the virulent materials and contaminated objects is of great importance, more especially as it appears that the natural virus may remain active for a long time outside the body. The soiled litter, dung, exudate, membranes, and fetus should all be removed at once, preferably after they have been treated with caustic lime. After removal they should be soaked in paraffin and burned, or buried in a deep pit, preferably the former. On no account should the fetus and membranes be fed to pigs or dogs. When a fetus is aborted alive, as sometimes happens, it seldom survives long, and it is advisable to kill and destroy it, since it may excrete abundance of virulent material from its intestines if allowed to live. If, however, it be decided not to kill it, it should immediately be isolated. The walls of the stall and the floor should be washed or strewn thickly with caustic lime, or drenched freely with boiling water. The temperature necessary to kill the bacillus is not great, and this simple method of disinfection should prove efficacious. Lastly, the boots, clothing, and hands of attendants should be disinfected by making use of any reliable disinfectant, such as 3 or 4 per cent solution of carbolic acid.

The keeping of a Goat amongst the Cows.—This, we believe can only have had its origin in ignorant superstition, but we feel bound to mention it, as the question of its efficacy has quite frequently been seriously put to us. We would point out that goats themselves can be infected with cattle abortion, and that both male and female goats were on our premises during the greater part of the time occupied with the cattle experiments, and their presence did not prevent animals from aborting.

Preventive Inoculation.—This is still in the experimental stage and definite results are hoped for. (Abridged.)

The Committee refrained from making any recommendations in regard to measures to be taken by the Board of Agriculture and Fisheries for the prevention of the disease.

Experience in connection with the beef cattle herd at the Illinois Agricultural Experiment Station with the methods of isolation, careful disposal of infected material, cleaning and disinfection of infected stalls, antiseptic irrigation of the genital passages of cows which had aborted, and antiseptic irrigation of the bull before and after service, together with the use of a special bull for heifers and clean cows, has been very satisfactory. These measures were applied under the direction of Professor H. W. Mumford and Mr. H. O. Allison. During the year previous to the inauguration of these measures a large percentage of the calves were lost by abortion. A decided improvement in respect to the number of calves saved was coincident with the use of the procedures mentioned above. They were applied to each case of abortion as it occurred, until in the course of two years abortions have become very infrequent and the herd is now considered free from the disease. It should be noted, however, that those cows which had aborted were not necessarily disposed of, but after local irrigation treatment until the discharge had ceased, they were bred again. Some of the improvement in the herd has, therefore, doubtless been due merely to the retention of relatively immune cows.

Altho the experience here has been rather fortunate and the results obtained seem to bear some relation to the employment of the measures deemed worthy by the British Committee, we hesitate to state that there was any necessary relation between them, because cattle men have observed somewhat similar improvement in herds without the use of any treatment at all. In other words, there appears to be a tendency for the disease sometimes to die out in a herd or to become quiescent for a year or two. On the other hand,

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