Publications

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the incidence and nature of prohibited animal tissues in boerewors ("country-style" sausage).sixty boerewors ("country-style" sausage) samples bought from butchers in pretoria were examined microscopically. it was found that 97% of these samples contained animal tissues that are not permitted in boerewors under the regulations of the foodstuffs, cosmetics and disinfectants act (act no. 54 of 1972). these regulations confine permitted tissues to fat and the musculature of cattle, sheep and pigs. details of the tissues revealed in the survey are provided, and the implications of their pre ...1977562415
two field strains of haemonchus contortus resistant to rafoxanide.two field strains of haemonchus contortus, one from pretoria on the highveld and the other from white river in the lowveld of the transvaal, showed pronounced resistance to rafoxanide at a dosage rate of 7.5 mg/kg live mass per os. both of these strains originated from kikuyu pastures under irrigation. resistance in south africa to rafoxanide and other anthelmintics, namely, closantel, ivermectin and the benzimidazoles is reviewed. it is concluded that apart from avoiding farming practices where ...19873306550
crimean-congo hemorrhagic fever in south africa.crimean-congo hemorrhagic fever virus was isolated for the first time in south africa in february 1981, from the blood of a 13-year-old boy who died in johannesburg after attending a camp in a nature reserve in the western transvaal. virus was isolated from 21/120 pools of questing ticks from the nature reserve, the infected species being hyalomma marginatum rufipes and h. truncatum. virus was also isolated from 4/38 pools of partially engorged ticks and other ectoparasites collected off hosts, ...19836418019
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
culicoides (diptera:ceratopogonidae) associated with livestock in the onderstepoort area, gauteng, south africa as determined by light-trap collections.in 54 light-trap collections made at 28 sites in the onderstepoort area a total of 178,941 culicoides midges of 35 species was collected in march 1988; the survey was repeated at 26 sites in september and yielded 19,518 culicoides of 24 species. the number of culicoides species collected totalled 38. c,imicola was the most abundant species at 27 of the 28 sites sampled, and accounted for 88% and 67% of all midges collected in the two months respectively. this study not only confirms that c. imic ...19969173363
phage types of salmonella enterica serovar enteritidis isolated in south africa from 1991-1995.a total of 615 strains of salmonella enterica serovar enteritidis (se), received from 1991-1995 at the onderstepoort veterinary institute (ovi), were phage typed. most se isolates (54,7%) originated from poultry followed by humans (28,5 %) and poultry eggs (9,6 %). phage type 34 was the most prevalent (40,5 %) of all isolates, followed by phage type 4 (33,8 %). other phage types identified were 1, lb, 4a, 7, 7a, 9a, 14, 24, 24var and 35 (in total 2,4% of isolates). most isolates of se were recei ...200011028749
genetic parameters for resistance to haemonchus contortus in merino sheep in south africa.resistance to natural infections of haemonchus contortus (wireworm) was studied in merino sheep. from february 1995 to july 1996 data were collected from the otk merino stud on the farm wildebeesfontein near hendrina in mpumalanga province. from march 1998 to january 2000 another merino flock at irene in gauteng province was included in the study. in both cases, 50 randomly-chosen animals from each group of lambs weaned were sampled weekly for faecal egg count (fec) until a mean of 2500 eggs per ...200212088074
an overview of the eradication of brucella melitensis from kwazulu-natal.brucella melitensis is a gram-negative bacterium whose primary hosts are goats and sheep. like the other brucelia spp., with the exception of brucella ovis, it is not particularly host specific as it is pathogenic for a variety of other mammal species including humans. in humans the disease caused by it is rated as one of the most important zoonoses. three outbreaks have been recorded in goats and sheep in south africa; the first outbreak occurred in sheep in 1965 in the mpumalanga and northern ...200212233997
haemonchus spp. in sheep farmed under resource-poor conditions in south africa--effect on haematocrit, conjunctival mucous membrane colour and body condition.a longitudinal study was conducted on the differential faecal egg counts, haematocrits and body condition scores of sheep belonging to resource-poor farmers at rust de winter, gauteng province, and kraaipan, north west province, south africa. the animals were scored for level of anaemia using the famacha method, an assay for the clinical evaluation of anaemia caused by haemonchus spp. periods of higher haemonchus egg counts occurred from october to march for sheep at rust de winter and from sept ...200212515298
little anthelmintic drenching required for lambs finished over winter and spring on annually re-established irrigated pasture on the highveld of gauteng province, south africa.as part of a trial to test the profitability of finishing weaner lambs over winter and spring on the highveld of gauteng province, an investigation was carried out over 4 consecutive years as to whether or not worm control was necessary while the lambs were on irrigated, improved pastures. pastures that had not been grazed by sheep or other livestock for at least 5 years were planted to annual ryegrass (lolium multiflora) that was ploughed under and replanted annually. weaner lambs were randomly ...200312836737
parasites of comestic and wild animals in south africa. ii. oestrus ovis in goats.during a period of 13 months, 130 goats' heads, obtained form the johannesburg municipal abattoir, were examined for infestation with oestrus ovis. investation was present in 73,8% of the heads and the mean burden comprised 4,4 larvae. such a small nuber of larvae were present that no clear seasonal incidence pattern could be determined. pupal periods could be as long as approximately 60 days for flies hatching during october and may and as short as approximately 24 days for those hatching from ...1977614525
parasites of domestic and wild animals in south africa. i. oestrus ovis in sheep.separate groups of 3 oestrid-free lambs were exposed to infestation on irrigated pasture for periods of approximalely 33 days each over30 months, and on dry-land pasture for approxomately 42 days over a period of 18 months. with some exceptions, the lambs slaughtered from october-june were found to be infested with oestrus ovis while, with one exception, those slaughtered from july-september were free. a minimum of 4 sheeps' heads, obtained weekly over 24 months from the pretoria municipal abatt ...1977614524
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