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Abstract

The degree of hypobiosis was determined from worm burdens recovered at necropsy in tracer calves allowed to graze plots contaminated by northern and southern cattle in both zones during the autumn of 1982 and spring of 1983. In the northern autumn, the northern (Ohio) isolate attained a...

Author(s)
Frank, G. R.; Herd, R. P.; Marbury, K. S.; Williams, J. C.
Citation
International Journal for Parasitology, 1986, 16, 4, pp 391-398
Abstract

Fifteen 4-month-old calves were infected with O. ostertagi and/or T. axei and the responses to phytolectins were evaluated. Whole blood cultures were incubated with phytohaemagglutinin (PHA), concanavalin A (Con A) and pokeweed mitogen (PWM). There was a decline in lymphocyte responsiveness to PHA...

Author(s)
Snider, T. G.; Williams, J. C.; Karns, P. A.; Romaire, T. L.; Trammel, H. E.; Kearney, M. T.
Citation
Veterinary Immunology and Immunopathology, 1986, 11, 3, pp 251-264
Abstract

In a series of experiments young goats and calves were experimentally infected with O. ostertagi L3 from calf and goat-passaged isolates. Patent infections were established in 73 out of 86 inoculated goats. The largest number of patent infection was observed when inoculation consisted of a single...

Author(s)
Williams, J. C.
Citation
Veterinary Parasitology, 1987, 23, 1/2, pp 51-67
Abstract

The epidemiology of O. ostertagi and other gastrointestinal nematodes in yearling beef cattle was examined in each of 2 successive years. During each year 50 head of newly weaned beef calves were each given a single dose of thiabendazole and then placed on experimental pastures. 24 of the animals...

Author(s)
Williams, J. C.; Knox, J. W.; Marbury, K. S.; Kimball, M. D.; Baumann, B. A.; Snider, T. G.
Citation
Parasitology, 1987, 95, 1, pp 135-153
Abstract

In a previous study the different hypobiotic responses by northern and southern isolates of O. ostertagi, when compared side by side in the north (Ohio) and the south (Louisiana), indicated a genetic difference between the 2 isolates. The pattern and frequency of hypobiosis of the transferred...

Author(s)
Frank, G. R.; Herd, R. P.; Marbury, K. S.; Williams, J. C.; Willis, E. R.
Citation
International Journal for Parasitology, 1988, 18, 2, pp 171-177
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

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