Jeremy Schroeder

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Ivermectin in an oral formulation was evaluated by the non-parametric method against a wide range of endoparasites of sheep in 15 trials involving a total of 297 sheep. Ivermectin at 200 micrograms/kg was more than 80% effective in more than 80% of the treated animals (i.e. Class A) against induced infestations of 3rd and 4th stage larvae and adults of(More)
During a period of 14 months two tracer calves per month were slaughtered after one month's exposure to natural helminth infestation on a farm in the Northern Transvaal Bushveld. Total parasitic helminth burdens, which were never large, were determined in order to define their seasonal incidence. The gastro-intestinal parasites that were recovered were(More)
Ivermectin was administered orally 6 times at 21d intervals at 400 micrograms/kg (double the recommended dosage) to 10 Merino rams. Ten other rams served as untreated controls. Semen samples were collected serially before and after each treatment, and evaluated for volume, density, colour, motility, pH, percentage live sperm and sperm morphology. One testis(More)
The efficacy of ivermectin administered at 200 micrograms/kg was evaluated against induced infestations of 5 gastrointestinal nematode species in cattle. Results were analysed by the modified non-parametric method and a "A" class (more than 80% effective in more than 80% of the treated animals) was achieved with an oral drench and subcutaneous injection(More)
Macroscopically visible ticks were collected from the hides of 28 cattle slaughtered in pairs during a period of 14 months in the Waterberg District. In order of prevalence Rhipicephalus appendiculatus, Rhipicephalus evertsi evertsi, Amblyomma hebraeum, Hyalomma marginatum rufipes, Ixodes cavipalpus, Hyalomma truncatum and Boophilus decoloratus were(More)
Six groups of 6 lambs each were treated orally with rafoxanide at dosages ranging from 0 to 37,5 mg/kg live mass in multiples of 7,5 mg/kg. The lambs were slaughtered 27 to 31 d after treatment for post mortem examination. No clinical, ophthalmological or pathological changes attributable to treatment were detected in any of the lambs. Possible differential(More)
Angora goat kids from the eastern Cape Province with natural infestations of Ostertagia circumcincta, Nematodirus spathiger, and Trichostrongylus rugatus were treated with albendazole, fenbendazole or morantel citrate, while a fourth group remained an untreated control group. The benzimidazoles were less than or equal to 50% effective against O.(More)