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Abstract

The epidemiology of O. ostertagi infection in cattle in the USA is reviewed. Current data suggests that there are seasonal differences in ostertagiasis based on a north and south plane, with larval inhibition occurring during autumn in the north and during spring in the south and parts of the west. ...

Author(s)
Williams, J. C.; Knox, J. W.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 23-38
Abstract

A series of experiments was conducted in which young goats and calves were experimentally infected with O. ostertagi L3 of calf-source and goat-source isolates. The goat-source isolate was derived from a continuous passage of the bovine parasite in goats. Patent infections resulted in 73 (85%) of...

Author(s)
Williams, J. C.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 85-87
Abstract

Ostertagia ostertagi soluble larval antigens were separated into 5 main fractions by SDS-PAGE. Sera from cattle with Type I infection, pre-Type II infection, cattle hyperimmune to fraction 1 (MW ≥ 36 000), and monoclonal anti-fraction 1 were used as probes for Western blot analysis of fractions 4,...

Author(s)
Cross, D. A.; Klesius, P. H.; Williams, J. C.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 151-168
Abstract

Yearling cattle in Louisiana, USA, were examined at monthly intervals for abomasal nematode burdens and histological lesions over a year. Tracer calves were grazed for 3 to 4 weeks and removed from pasture for 2 to 3 weeks, then slaughtered; a few animals were killed in extremis shortly after...

Author(s)
Snider, T. C., III; Williams, J. C.; Knox, J. W.; Marbury, K. S.; Crowder, C. H.; Willis, E. R.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 169-179
Abstract

Experiments were carried out during summer and winter conditions to determine if D. viviparus infective larvae could survive on pasture during these seasons in Louisiana, USA. Pairs of tracer calves were grazed in August and September on a pasture that was heavily contaminated in May and then left...

Author(s)
Eddi, C. S.; Williams, J. C.; Swalley, R. A.
Citation
Proceedings of the Helminthological Society of Washington, 1988, 55, 2, pp 171-174
Abstract

Sixteen parasite-free, 4-month-old calves were divided into groups of 4 and inoculated with 66 000 L3 of O. ostertagi (group 1), 66 000 L3 of T. axei (group 2), 33 000 L3 of O. ostertagi and 33 000 L3 of T. axei (group 3), or left as untreated controls. After 6 weeks, calves of groups 1 and 3 were...

Author(s)
Snider, T. G., III; Williams, J. C.; Karns, P. A.; Markovits, J. E.; Romaire, T. L.
Citation
American Journal of Veterinary Research, 1988, 49, 12, pp 2101-2104
Abstract

An experiment was conducted to compare the anthelmintic efficacy of albendazole (ABZ), levamisole (LEV) and fenbendazole (FBZ) against inhibited early 4th-stage larvae (EL4) of Ostertagia ostertagi during April in Louisiana, USA. Forty cross-bred beef heifers (average weight 165 kg) were acquired...

Author(s)
Williams, J. C.
Citation
Veterinary Parasitology, 1991, 40, 1-2, pp 59-71
Abstract

Levamisole (LEV) was tested in 4 experiments to compare efficacy values against O. ostertagi when larval maturation was occurring (September), following inhibition and also when populations were expected to be largely adult (winter). A primary objective was to determine the importance of developing ...

Author(s)
Williams, J. C.; Knox, J. W.; Marbury, K. S.; Swalley, R. A.; Eddi, C. S.
Citation
Veterinary Parasitology, 1991, 40, 1-2, pp 73-85
Abstract

A total of 324 steers were randomly allotted into 4 treatment groups. Preliminary slaughters indicated that 95% of the cattle had O. ostertagi inhibited larvae. Nine calves from each group were examined at slaughter for efficacy evaluation 12 or 13 days after treatment. Efficacies against inhibited ...

Author(s)
Williams, J. C.; Bechtol, D. T.; Hollis, L. C.; Herschler, R. C.
Citation
Agri-Practice, 1991, 12, 5, pp 14-15, 17-20
Abstract

The anthelmintic efficacy of ivermectin (IVM) delivered from a sustained-release (SR) bolus was evaluated against natural infections with gastrointestinal tract nematodes in 12 crossbred beef heifers in spring in Louisiana, USA. The 12 calves were randomly allotted to 2 groups of 6 calves each....

Author(s)
Williams, J. C.; Plue, R. E.
Citation
American Journal of Veterinary Research, 1992, 53, 5, pp 793-795

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