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Phenothiazine as an Anthelmintic for Breeding Ewes¹

The Pennsylvania State College

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.

¹ Authorized for publication on November 28, 1944 as paper No. 1258 in the journal series of the Pennsylvania Agricultural Experiment Station from the Department of Animal Husbandry.

² The authors, express their appreciation to Miss Marion Learned for assistance with blood studies, to Prof. W. B. Connell of the Extension Service for many helpful suggestions, and to county agricultural agents and farmers cooperating in Centre, Greene, Potter and Tioga counties, and to E. I. du Pont de Nemours and Co, Wilmington, Del., for the powdered phenothiazine used.