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Abstract

The interactions between O. ostertagi and C. oncophora were studied in calves by concurrent and sequential infections. A reciprocal negative interaction between the 2 species was found in sequential, but not in concurrent infections. This result was supported by the finding of serological...

Author(s)
Kloosterman, A.; Albers, G. A. A.; Van den Brink, R.
Citation
Veterinary Parasitology, 1984, 15, 2, pp 135-150
Abstract

Two trials with stabled milking cows were carried out. In the first, cows were either experimentally infected with O. ostertagi larvae or served as naturally-infected controls. In the 2nd, cows were treated the same as in the first trial, but in addition half of the number of cows of each group...

Author(s)
Kloosterman, A.; Borgsteede, F. H. M.; Eysker, M.
Citation
Veterinary Parasitology, 1984, 17, 4, pp 299-308
Abstract

Interactions between gastrointestinal worms (Ostertagia ostertagi, Cooperia oncophora) and lungworms (Dictyocaulus viviparus) in calves were studied by assessing the effect of primary infections with either group of worms on the development of homologous or heterologous challenge infections....

Author(s)
Kloosterman, A.; Frankena, K.
Citation
Veterinary Parasitology, 1988, 26, 3-4, pp 305-320
Abstract

Three groups of eight 3-month-old Friesian calves were orally inoculated with 5000 L3 of Ostertagia spp. and 5000 L3 of Cooperia spp. 3 times/week for 3, 5 and 7 weeks, respectively; 7 calves from each group served as uninfected controls. One week later, 4 of the infected animals from each group...

Author(s)
Kloosterman, A.; Frankena, K.; Ploeger, H. W.
Citation
Veterinary Parasitology, 1989, 33, 2, pp 155-163
Abstract

Three-month-old calves were infected 3 times weekly during a 5-week period with C. oncophora, O. ostertagi or a combination of these 2 species. For each type of infection 2 dose levels were applied. In addition one group of calves was kept uninfected. After removal of the primary infection by...

Author(s)
Kloosterman, A.; Ploeger, H. W.; Frankena, K.
Citation
Veterinary Parasitology, 1990, 36, 1-2, pp 117-122
Abstract

Calves were infected repeatedly during a period of 6 weeks with O. ostertagi and C. oncophora, at an age of 3, 6 or 9 months. The inoculations were performed during 3 periods, February-March, May-June and August-September, to account for possible seasonal effects or effects of larval batches....

Author(s)
Kloosterman, A.; Ploeger, H. W.; Frankena, K.
Citation
Veterinary Parasitology, 1991, 39, 1-2, pp 101-113
Abstract

An experiment was carried out simultaneously in Glasgow, Scotland and in Wageningen, The Netherlands to investigate possible differences between the local strains of O. ostertagi and C. oncophora. In each location calves of the local Friesian breed were infected with 100 000 L3 of either the...

Author(s)
Bairden, K.; Frankena, K.; Parkins, J. J.; Armour, J.; Kloosterman, A.
Citation
Research in Veterinary Science, 1992, 52, 1, pp 22-27
Abstract

Available data in the literature on the quantitative relationship between level of exposure to infection and growth performance are summarised. Based on questions derived from earlier work concerning the relationships between infection, growth performance and acquired immunity during the entire...

Author(s)
Ploeger, H. W.; Kloosterman, A.
Citation
Veterinary Parasitology, 1993, 46, 1-4, pp 223-241
Abstract

In 2 experiments, groups of calves were exposed to different levels and patterns of infection with Ostertagia spp. and Cooperia spp. The experimental design simulated the stereotypic pattern of herbage infestation, including a normal or a delayed midsummer increase, under conditions of...

Author(s)
Ploeger, H. W.; Kloosterman, A.; Rietveld, F. W.; Berghen, P.
Citation
Veterinary Parasitology, 1995, 56, 1/3, pp 91-106
Abstract

Bulk milk samples were collected from 134 farms at monthly intervals on 3 occasions in 1992. ELISA titres to Ostertagia ostertagi found in October at the end of the grazing season served as a basis to select 16 and 18 farms as having high and low levels of parasitism, respectively. Heifers and cows ...

Author(s)
Kloosterman, A.; Ploeger, H. W.; Pieke, E. J.; Lam, T. J. G. M.; Verhoeff, J.
Citation
Veterinary Parasitology, 1996, 64, 3, pp 197-205

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