Phenothiazine as an Anthelmintic for Breeding Ewes1

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 © . .