Researches into dips and dipping. A. Lime-sulphur dips. Paper V. The minimum effective concentration of lime-sulphur dips for sheep scab eradication

Abstract

The tests demonstrate that lime-sulphur dips used at a strength varying between 0.9 and 0.3 per cent. polysulphide sulphur may be effective in curing sheep of scab when badly infected. When used at a lower concentration it was found to be ineffective. In one test, however, in which the strength of the first clip was 0.25 per cent. and the second dip 0.3 per cent. polysulphicle sulphur, some of the sheep were apparently cured of the disease as only fresh lesions could be found on them, indicating that they had become reinfected through contact with others which were not cured. It is obvious, therefore, that the dip, when used at a strength of 0.3 per cent., cannot always be relied upon to cure animals of scab, and should, in the interests of safety, be avoided at all stages in the process of dipping.