• Could bats act as reservoir hosts for Rift Valley fever virus? 

  Oelofsen, M.J.; Van der Ryst, E.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The inter-epizootic reservoir host of Rift Valley fever virus (RVFV) remains unknown, although the namaqua rock rat, Aethomys namaquensis, as well as bats have been implicated. Bats can be asymptomatically infected with ...
• Comparison of indirect fluorescent antibody test and enzyme linked immunosorbent assay in the detection of exposure of cattle to Theileria parva in Kenya 

  Muraguri, G.R.; Gitau, P.K.; Mwangi, Michael N.; Mbogo, S.K.; Kariuki, D.P.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Appraisal of the indirect fluorescent antibody test (IFAT) and antigen enzyme linked immunosorbent assay (ELISA) serological tests as carried out to detect cattle exposed to Theileria parva at the National Veterinary ...
• Influence of lactation on the prolactin secreting cells of the hypophysis of impala (Aepyceros melampus): An immunocytochemical and computer image analysis study 

  Van der Merwe, P.; Meltzer, David George Anton; Van Aswegen, G.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Acute stress in the course of wildlife management has been intensively investigated. Chronic stress, on the contrary, has not been researched at all, probably due to the difficulty in measuring it as a result of the ...
• Subject index 

  Anonymous; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)
• Anthelmintic resistance in South Africa: surveys indicate an extremely serious situation in sheep and goat farming 

  Van Wyk, Jan Aucamp; Stenson, M.O.; Van der Merwe, J.S.; Vorster, R.J.; Viljoen, P.G.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Surveys to determine the prevalence and degree of resistance of Haemonchus spp. of sheep and goats to the available anthelmintics in South Africa indicate that small ruminant production is entering a crisis situation ...
• Author index 

  Verwoerd, Daniel Wynand (Pretoria : Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)
• A comparison of the infectivity of cryopreserved versus unfrozen infective larvae of Haemonchus contortus, Trichostrongylus colubriformis and Trichostrongylus axei. Results of the Onderstepoort Veterinary Institute and collaborators from 1977 to the present 

  Van Wyk, Jan Aucamp; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The infectivity for sheep of cryopreserved infective larvae (L3) of various strains of Haemonchus contortus, Trichostrongylus colubriformis and Trichostrongylus axei is compared using previously published results of trials ...
• Detection of Mycoplasma gallisepticum and Mycoplasma synoviae antibodies in the sera of indigenous chickens by rapid serum agglutination test at Mmopane, Gaborone, Botswana 

  Mushi, E.Z.; Binta, M.G.; Chabo, R.G.; Mathaio, M.; Ndebele, R.T.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The mean flock size was ten chickens per rural farmer. Antibodies to Mycoplasma gallisepticum and Mycoplasma synoviae were detected in 57,88 % and 67,33 % of the chicken sera respectively.
• Evaluation of coloured targets for the attraction of Glossina brevipalpis and Glossina austeni (Diptera: Glossinidae) in South Africa 

  Kappmeier, Karin; Nevill, E.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Studies on the attractiveness of various coloured targets for Glossina brevipalpis and G. austeni in South Africa showed black and pthalogen blue (p.blue) combinations to be the most effective for both species. A 2 m ...
• Evaluation of conventional odour attractants for Glossina brevipalpis and Glossina austeni (Diptera: Glossinidae) in South Africa 

  Kappmeier, Karin; Nevill, E.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The components of the synthetic ox-odour used in Zimbabwe against Glossina pallidipes and G. m. morsitans were evaluated for the attraction of G. brevipalpis and G. austeni in South Africa. The Zimbabwe mixture (Zim-mix), ...
• Evaluation of a proposed odour-baited target to control the tsetse flies Glossina brevipalpis and Glossina austeni (Diptera: Glossinidae) in South Africa 

  Kappmeier, Karin; Nevill, E.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The most effective odour attractant for G. brevipalpis Newstead, namely a combination of octenol released at c. 9,1 mg/h, 4-methyl phenol released at c. 15,5 mg/h and acetone released at c. 350 mg/h, when used together ...
• An anatomical study of the respiratory air sacs in ostriches 

  Groenewald, Hermanus B.; Soley, John Thomson; Bezuidenhout, A.J. (Abraham Johannes), 1942-; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  An accurate description of the number, location and relative position of the air sacs and their diverticula in the ostrich is essential for a better understanding of the pathogenesis of air sacculitis in this bird. The ...
• The helminths of ranch calves in the North-eastern Mountain Grassland of South Africa 

  Louw, J.P.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The cumulative total helminth parasite burdens of ranch calves during their first seven months of life on the North-eastern Mountain Grassland of South Africa were determined during two consecutive years. Trichostrongylus ...
• Presence of antibodies to canine distemper virus, canine parvovirus and canine adenovirus type 1 in free-ranging jackals (Canis adustus and Canis mesomelas) in Zimbabwe 

  Spencer, J.A.; Bingham, J.; Heath, R.; Richards, B.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  A survey of free-ranging jackals (Canis adustus and Canis mesomelas) in Zimbabwe was conducted to determine the prevalence of serum antibodies to canine distemper virus (CDV), canine parvovirus (CPV) and canine adenovirus ...
• A serological survey of bovine babesiosis in northern and eastern Zimbabwe 

  Katsande, Tendai C.; More, S.J.; Bock, R.E.; Mabikacheche, L.; Molloy, J.B.; Ncube, C.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The geographical distribution of Babesia bovis and Babesia bigemina antibodies in communal herds in northern and eastern Zimbabwe was determined using the ELISA technique. The animals in different herds in the study ...
• The production and evaluation of Pasteurella haemolytica leukotoxin in the supernatant of submerged cultures in fermenters 

  Odendaal, M.W.; Ellis, Charlotte Elizabeth; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The optimal production of P. haemolytica leukotoxin in the culture supernatant of a fluid medium is dependent on a number of factors. The leukotoxin has to be produced by using a strain that is known for its ability to ...
• Copper poisoning in the Kruger National Park: field investigation in wild ruminants 

  Grobler, D.G.; Swan, Gerry E.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Chronic copper poisoning was investigated in ruminants within the Phalaborwa area of the Kruger National Park (KNP). Exposure of ruminants to environmental copper pollution resulting from copper smelting operations of a ...
• Attempted induction of chronic copper poisoning in boma confined impala 

  Grobler, D.G.; Swan, Gerry E.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Induction of chronic copper poisoning in ten boma-confined impala was attempted in a randomized, single dose, parallel designed, titration study using five increasing oral doses, ranging between 125 mg/kg to 1000 mg/kg, ...
• Parasites of domestic and wild animals in South Africa. XXXVII. Ixodid ticks on cattle on Kikuyu grass pastures and in Valley Bushveld in the Eastern Cape Province 

  Horak, Ivan Gerard; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  Individual calves, exposed to infestation for 14 d on dry-land Kikuyu grass pastures on the coast near Alexandria, were slaughtered at approximately monthly intervals over a period of 2 years and examined for ticks. Although ...
• Investigation of the viability of M. bovis under different environmental conditions in the Kruger National Park 

  Michel, Anita Luise; Tanner, M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)

  The survival time of Mycobacterium bovis in the natural habitat of infected free ranging wildlife was investigated. Seven different experimental sites near Skukuza in the Kruger National Park, South Africa, were selected ...

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