Impact of synthetic pyrethroid sheep dip on the microflora in animal slurry/faeces "

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This work investigated the effect of different concentrations of Amiraz 20 (a synthetic pyrethroid sheep dip acaricide widely used in Ghana for the treatment of ectoparasites), mixed with animal faecal matter and soil, on the numbers of bacteria and protozoans. Sterilized distilled water was used as a control. Total and faecal coliforms, enterococci and protozoa were enumerated using standard methods. The freshly voided faeces contained (MPN/g wet weight) 6.8xl02' of total coliforms, 6.8xl016 of faecal coliforms, 1.7xl02 cfu/g of enterococci and 16 per gram of protozoan cyst. However mean protozoan cyst numbers decreased to 10 for samples mixed with 0.1 %, 5 for samples mixed with 1 %, and to 2 for samples mixed with 5 % Amiraz 20. Higher concentrations of Amiraz 20 sheep dip resulted in a decrease in protozoa cysts counts, (2) and an increase in bacteria numbers, 1.2x10'9. Application of animal slurry mixed with Amiraz 20 showed decreased soil pH, % Phosphorus and % Nitrogen. These findings have implications for the contamination of animal slurries, soil and aquatic systems, in that there is the potential for significant increases in microbial numbers, containing putative pathogens due to the diminution of bacteriophagous protozoan populations.
A project report submitted to the Department of Theoretical and Applied Biology, Faculty of Biosciences, College of Science, in partial fulfilment of the requirements for the award of the Msc Environmental Science degree.