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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
Abstract

The residual effect of a 0.2 mg/kg injectable formulation of moxidectin for use against lungworm and gastrointestinal nematodes in cattle was studied in a grazing experiment in the Netherlands. 5 groups of 4 calves were grazed from May to October, 1991, with another group kept as permanently housed ...

Author(s)
Eysker, M.; Boersema, J. H.; Cornelissen, J. B. W. J.; Kloosterman, A.; Kooyman, F. N. J.
Citation
Veterinary Parasitology, 1996, 61, 1/2, pp 61-71
Abstract

In 2 experiments, groups of calves which had been exposed to different levels and patterns of infection with Ostertagia and Cooperia spp. in a simulated first grazing season (FGS), were followed throughout a natural second grazing season (SGS). Milk yields in the subsequent first lactation period...

Author(s)
Ploeger, H. W.; Kloosterman, A.; Rietveld, F. W.; Hilderson, H.; Berghen, P.; Pieke, E. J.
Citation
Veterinary Parasitology, 1996, 65, 1/2, pp 99-115
Abstract

In two 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 both a normal and a delayed midsummer increase, under conditions of...

Author(s)
Ploeger, H. W.; Kloosterman, A.; Rietveld, F. W.
Citation
Veterinary Parasitology, 1995, 58, 1/2, pp 61-74
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.; Hilderson, H.; Hollanders, W.
Citation
Veterinary Parasitology, 1994, 55, 4, pp 287-315
Abstract

Antibodies against Ostertagia spp., Cooperia spp. and Dictyocaulus viviparus were assessed in serum and individual milk samples of cows and in bulk milk samples from the refrigerating tank. Titres in milk samples were related to serum titres, but also influenced by milk yield, lactation stage and...

Author(s)
Kloosterman, A.; Verhoeff, J.; Ploeger, H. W.; Lam, T. J. G. M.
Citation
Veterinary Parasitology, 1993, 47, 3-4, pp 267-278
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

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

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 ELISA was used to detect serum pepsinogen and albumen, gastrin and antibodies against Cooperia, Ostertagia and Dictyocaulus species for diagnosis of parasitism in 7 untreated 5-8 month old calves and 7 calves treated with an oxfendazole pulse-release bolus (OPRB). During the grazing season, no...

Author(s)
Hilderson, H.; Vercruysse, J.; Dorny, P.; Berghen, P.; Kloosterman, A.
Citation
Preventive Veterinary Medicine, 1990, 8, 4, pp 283-290

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