Diseases of swine, with particluar reference to hog-cholera . erum. In the United States Bureau of Animal In-dustry Serum Plant at Ames, Iowa, Dr. Niles has used the samestrain of virus for the last ten years, and produces a serum of un-questionable strength and protective power, as shown by the re-sults of repeated field trials. The greatest disadvantage to this method of securing virusblood is the cost. Young shoats of this size and age are ratherhard to obtain, especially if the serum plant is not located at some 336 DISEASES OF SWINE large packing center. Farmers do not care to sell pigs o
Diseases of swine, with particluar reference to hog-cholera . erum. In the United States Bureau of Animal In-dustry Serum Plant at Ames, Iowa, Dr. Niles has used the samestrain of virus for the last ten years, and produces a serum of un-questionable strength and protective power, as shown by the re-sults of repeated field trials. The greatest disadvantage to this method of securing virusblood is the cost. Young shoats of this size and age are ratherhard to obtain, especially if the serum plant is not located at some 336 DISEASES OF SWINE large packing center. Farmers do not care to sell pigs of thisweight, as they are just beginning at this age to get to the pointwhere they will show a profit. Last summer it was necessary forthe Ames plant to offer as high as 12 and 13 cents a pound forpigs of this weight. As the amount of virus needed is large, andthe amount of blood obtainable from a single pig of this weight verysmall, it can be seen that the cost of production of virus blood inthis manner is quite high. In fact, the greatest expense attached. Fig. 57.—Pens in which hogs are placed for production of virus pens are used for housing of animals used in serum tests. (Photo byH. K. Mulford Co.) to the manufacture of hog-cholera serum is the cost of the virusblood. If some means could be devised for cutting down this cost,without decreasing the quality of the virus, there would be a bigreduction in the cost of serum treatment. Manner of Securing Virus Blood.—The method of securingvirus blood by means of injection of susceptible pigs with a virusof known quality is so far superior to other methods that it wouldseem advisable to give a detailed description of this method: MANUFACTURE OF HOG-CHOLERA SERUM 337 As already stated, there is selected for this purpose a virus thatis of the very best quality obtainable. This is injected in doses of2 to 5 into the muscles of the inner side of the thigh. Theinjected pig is then placed in a pen and allowed to
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1914
