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Abstract

Excretory-secretory products (ESP) were collected from in vitro- maintained O. radiatum larvae during the period in which the larvae molt from the 3rd to 4th larval stage. The ESP were used to immunize 13 uninfected calves which were subsequently challenged with 1.7 × 104 infective O. radiatum ...

Author(s)
Gasbarre, L. C.; Douvres, F. W.
Citation
Veterinary Parasitology, 1987, 26, 1-2, pp 95-105
Abstract

Four- to 6-month-old calves raised on clean pastures were allowed to graze for about 30 days on pastures naturally contaminated with Ostertagia ostertagi, Cooperia spp., Haemonchus placei, and Nematodirus helvetianus. The calves were then housed on concrete for 3 weeks before slaughter. At necropsy ...

Author(s)
Murrell, K. D.; Leighton, E. A.; Boswell, B. A.; Gasbarre, L. C.
Citation
Journal of Parasitology, 1989, 75, 3, pp 360-366
Abstract

In order to evaluate whether soluble O. radiatum antigens could induce protective immunity, a soluble fraction was obtained from disrupted adult worms, and this fraction was used to vaccinate calves. The vaccination protocol involved 2 immunizations. The first was administered intramuscularly with...

Author(s)
Gasbarre, L. C.; Canals, A.
Citation
Veterinary Parasitology, 1989, 34, 3, pp 223-238
Abstract

Differences in nematode faecal egg counts from 167 purebred Angus calves born in 1986, and 133 born in 1987 that had been naturally exposed to infection on pasture were analyzed for sire effects. The calves were sired by 26 different bulls, all of which were related. Differences among faecal egg...

Author(s)
Leighton, E. A.; Murrell, K. D.; Gasbarre, L. C.
Citation
Journal of Parasitology, 1989, 75, 4, pp 498-504
Abstract

Previous studies have indicated that host genetics significantly affects the number of gastrointestinal nematode ova in the faeces of calves during their first grazing season. An entire calf crop in Maryland, USA, of approximately 190 animals, was monitored monthly until weaning. A significant...

Author(s)
Gasbarre, L. C.; Leighton, E. A.; Davies, C. J.
Citation
Veterinary Parasitology, 1990, 37, 3-4, pp 257-272
Abstract

The experiment reported comprised 3 groups of calves, (+P2), (-P2) and (-P1), which all started their first grazing season as parasite-free calves. The (+P2) and (-P2) groups grazed for 2 seasons. In the first season the (-P2)-group of calves was grazing a pasture with no detectable...

Author(s)
Grønvold, J.; Nasen, P.; Gasbarre, L. C.; Christensen, C. M.; Larsen, M.; Monrad, J.; Midtgaard, N.
Citation
Acta Veterinaria Scandinavica, 1992, 33, 4, pp 305-316
Abstract

Studies have shown that the number of gastrointestinal nematode eggs release per gram of faeces (EPG) of calves is strongly influenced by host genetics. The purpose of this study was to determine if host genetics also influenced immune recognition of parasite antigens in these same calves. Serum...

Author(s)
Gasbarre, L. C.; Leighton, E. A.; Davies, C. J.
Citation
Veterinary Parasitology, 1993, 46, 1-4, pp 81-91
Abstract

A study was undertaken in Denmark to investigate whether experimental, mixed trichostrongyle infections of stabled calves prior to their first grazing season could confer sufficient immunity to significantly reduce egg excretion after turnout, and thereby prevent loss-producing infections later on. ...

Author(s)
Nansen, P.; Stefan, P. E.; Christensen, C. M.; Gasbarre, L. C.; Monrad, J.; Grønvold, J.; Henriksen, S. A.
Citation
International Journal for Parasitology, 1993, 23, 5, pp 627-638
Abstract

Serum anti-Ostertagia ostertagi and anti-Cooperia oncophora antibody responses were assessed in first season and second season calves grazing permanent paddocks. Calves without previous exposure to trichostrongyles were found to mount significant parasite-specific IgG1 antibody responses within two ...

Author(s)
Gasbarre, L. C.; Nansen, P.; Monrad, J.; Gronveld, J.; Steffan, P.; Henriksen, S. A.
Citation
Research in Veterinary Science, 1993, 54, 3, pp 340-344
Abstract

Partial genomic DNA libraries for Ostertagia ostertagi (Oo), Haemonchus placei (Hp), Cooperia oncophora (Co), and Oesophagostomum radiatum (Or) were generated and differentially screened with radiolabelled homologous and heterologous genomic DNA. Clones were identified from each species which did...

Author(s)
Christensen, C. M.; Zarlenga, D. S.; Gasbarre, L. C.
Citation
Experimental Parasitology, 1994, 78, 1, pp 93-100

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