The Efficiency of the Phenothiazine Salt Mixture and Drench for Sheep1

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Abstract
Although there is more to be learned about the efficient use of phenothiazine, on the basis of this and other work, it is thought that definite recommendations can be made at this time. The use of phenothiazine, either as a salt mixture or as a drench, may be modified for various localities, depending upon climatic conditions and the general management practices. The 1–9 phenothiazine and salt mixture, prepared by mixing 1 pound of phenothiazine powder with 9 pounds of granular salt, if properly administered, is an efficient non-toxic anthelmintic for mature sheep. The difference in efficiency for lambs and ewes is probably due to the fact that the young lamb does not consume enough of the salt mixture when needed most and the further fact that the lamb is more susceptable than the ewe to parasitism. The use of phenothiazine and salt is a preventive measure and is not expected to control parasitism in heavily infested animals. The following general recommendations are made: Copyright © . .

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