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Phenothiazine as an Anthelmintic for Sheep

Florida Agricultural Experiment Station

Abstract

An experimental flock of sheep has been maintained at the North Florida Experiment Station Station, Quincy, since 193. A permanent pasture consisting largely of carpet grass was established to afford grazing for the sheep. During the first year no losses occurred that could be attributed to parasitic infestation. When the sheep began grazing on the permanent pasture it was hoped that through rotation of improved permanent pastures that internal parasites could be controlled. After grazing on the improved pasture area for several months losses began to occur in both lambs and mature sheep. Post mortem examinations revealed the presence of large numbers of internal parasites.

A systematic program for drenching the sheep was inaugurated. The sheep, including the lambs, were drenched every 28 days with a 1 percent solution of copper sulphate and nicotine sulphate. The results obtained at first from drenching with these drugs were encouraging; however, losses continued to occur and began to increase even though treatment was given every month.

¹ The authors are Assistant Animal Husbandman, North Fla. Exp. Sta., Quincy, and Parasitologist, Florida Agr. Exp. Sta., Gainesville, respectively.