Publications

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the seasonal activity of adult ixodid ticks on angora goats in the south western orange free state.adult ixodid ticks were collected at 2-weekly intervals for a period of 23 consecutive months from 15 to 20 angora goats on a farm in the south western orange free state. a total of 6 ixodid tick species were recovered. rhipicephalus punctatus was the most abundant and prevalent tick. it was present from spring to late summer. ixodes rubicundus was the next most abundant tick and was present mainly from march or april to july with peak numbers present in april or may. the onset of this tick's ac ...19911770478
an undescribed rhipicephalus species associated with field paralysis of angora goats.paralysis of angora goat kids caused by adult ticks, which most probably belong to an undescribed species of the rhipicephalus pravus group, is described. confirmed cases of paralysis occurred in the south-western orange free state between the second half of september and the first half of november as well as during the first half of february. the mean female tick burdens (mean = 21.4) of paralysed angora kids were significantly higher than those of healthy kids (mean = 4.4). the predilection at ...19883361560
the distribution of pasteurella haemolytica serotypes among cattle, sheep, and goats in south africa and their association with diseases.over an 8-year period (september 1986 to march 1994), a total of 497 organ specimens from sheep and goats and 96 from cattle, were received for their isolation of pasteurella haemolytica. they were collected in seven geographical areas in south africa (as it existed before the april 1994 elections). these areas include the eastern cape, transvaal (new name: gauteng), nambia, orange free state (new name: free state), natal (new name: kwazulu-natal), western cape and the northern cape. this invest ...19958668319
seasonal dynamics of the karoo paralysis tick (ixodes rubicundus): a comparative study on merino and dorper sheep.karoo paralysis in south africa is induced in livestock by feeding female ixodes rubicundus ticks when infestation densities on hosts exceed certain critical levels. it has been shown previously that angora goats are at a higher risk of being paralysed than merino sheep, and such differences have been related to differences in feeding behaviour and spatial distribution of the two small-stock breeds. we hypothesized that differences in infestation densities with karoo paralysis ticks would also o ...19969173358
neurotoxicity in calves induced by the plant, nierembergia hippomanica miers var. violacea millán in south africa.the plant nierembergia hippomanica var. violacea has been incriminated in field outbreaks of neurotoxicity in calves in the free state province. hepatotoxicity and electrocardiogram (ecg) deviations were induced in a sheep dosed with 5 g/kg dried plant material on four consecutive days. a calf dosed with 2.5 g/kg dried plant material, on two consecutive days, did not show overt clinical changes. voluntary ingestion of approximately 30 g/kg fresh flowering plants by a second calf resulted in nerv ...199910631710
parasitic helminths of veterinary importance in cattle, sheep and goats on communal farms in the northeastern free state, south africa.the purpose of the study was to record and determine intensities, seasonal incidence and distribution of helminth parasites of veterinary importance that occur in cattle, sheep and goats in the northeastern free state. the study was conducted at harrismith and kestell and in qwa-qwa from march 2000 to may 2001. cattle of various breeds (including bonsmara, simmentaler and friesian), merino sheep and angora goats were sampled. faecal samples were analysed using the mcmaster and visser sieve techn ...200312967050
ticks and tick-borne diseases of livestock belonging to resource-poor farmers in the eastern free state of south africa.the paper provides a summary of three studies conducted in the eastern free state of south africa between 1998 and 2000. in a questionnaire-based study approximately 21% of interviewed resource-poor farmers (n = 150) indicated that they experienced problems with ticks and tick-borne diseases. about 56% of farmers indicated that tick-related problems were most severe in summer, while 32% indicated that the most problems were encountered in winter. about 12% indicated that the tick problems were e ...200214570134
a survey of tick control methods used by resource-poor farmers in the qwa-qwa area of the eastern free state province, south africa.a survey conducted in five villages in a resource-poor farming community in qwa-qwa, using the rapid rural appraisal technique and a questionnaire survey, showed that a significant proportion of the farmers (84%) use traditional or alternative methods to control ectoparasites, while 16% use commercial acaricides (chi2 = 7.1; p < or = 0.05). alternative control methods included the use of used engine oil, household disinfectant and paraffin. killing of ticks was the main reason for control (40%), ...200516300193
seasonal occurrence of karoo paralysis in angora goats in relation to the infestation density of female ixodes rubicundus.the seasonal occurrence of karoo paralysis in relation to the infestation density of female ixodes rubicundus was investigated in an enzootic area of the southwestern orange free state, south africa. young and adult angora goats were exposed to infestation during two paralysis tick seasons. only the young goats became paralysed and their infestation densities (female ticks kg-1 host body weight) were significantly higher than those of healthy animals. the infestation densities on paralysed goats ...19921502788
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