Phenothiazine as an Anthelmintic for Breeding Ewes1

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Abstract
The phenothiazine drench and 1‒9 salt mixture is recommended as an anthelmintic for breeding ewes. The 1–9 phenothiazine and salt mixture, prepared by mixing 1 pound of phenothiazine powder with 9 pounds of granular salt, is considered a preventive measure. The toxicity of the continuous administration of the 1–9 mixture has not been definitely established over a long period of time; however, in this form it is considered a relatively non-toxic anthelmintic. No indication of toxicity has been observed when administered in this form to sheep during the grazing season only. A low residual parasite infestation in the ewe will produce a significant infestation in the lamb. The 1–9 phenothiazine salt mixture is a satisfactory procedure when supplemented with the fall and spring drench as previously recommended. Copyright © . .

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