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Abstract

In Louisiana, USA, post-mortem worm counts on the abomasa of 7 yearling beef steers in early February (1977) revealed from 5,000 to 20,000 Ostertagia ostertagi/steer of which 13.7 to 51.6% (average 36.2%) were inhibited (early 4th-stage) larvae. In controlled tests at the end of February...

Author(s)
Williams, J. C.; Knox, J. W.; Sheehan, D.; Fuselier, R. H.
Citation
Veterinary Record, 1977, 101, 24, pp 484-486
Abstract

In northwest Louisiana, USA, beginning in November 1977 two or 3 cattle were removed each month from a grazing herd and examined post-mortem to find out when inhibited 4th-stage larvae of Ostertagia ostertagi were most numerous. Peak worm populations (50 000 to 100 000/animal) were discovered in...

Author(s)
Williams, J. C.; Knox, J. W.; Sheehan, D. S.; Fuselier, R. H.
Citation
American Journal of Veterinary Research, 1979, 40, 8, pp 1087-1090
Abstract

In Louisiana, USA, 2 yearling cattle were removed from pasture in late January, 2 in early February and 3 in early March. All were held in drylot for 2 or 3 weeks before slaughter. Ostertagia ostertagi worm burdens of those removed in January and February were similar but in the February group the...

Author(s)
Williams, J. C.; Knox, J. W.; Baumann, B. A.; Snider, T. G.; Kimball, M. G.; Hoerner, T. J.
Citation
American Journal of Veterinary Research, 1981, 42, 12, pp 2077-2080
Abstract

At 3 locations in Louisiana, USA, naturally infected yearling cattle were killed monthly over a 3-year period (1977-80) for worm counts. At 2 of the locations in 1978-79 tracer calves were grazed for monthly periods from late autumn to summer and these were also killed for worm counts. Ostertagia...

Author(s)
Williams, J. C.; Knox, J. W.; Baumann, B. A.; Snider, T. G.; Kimball, M. D.; Hoerner, T. J.
Citation
International Journal for Parasitology, 1983, 13, 2, pp 133-143
Abstract

In May 1982, naturally infected yearling heifers at the Red River Research Station, Louisiana, USA, were given fenbendazole at 7.5 or 10.0 mg/kg body weight against inhibited early 4th-stage larvae of O. ostertagi and other intestinal nematodes. The mean numbers of O. ostertagi in 10 untreated...

Author(s)
Williams, J. C.; Knox, J. W.; Marbury, K. S.; Kimball, M. D.; Scheide, S. W.; Snider, T. G.; David, M. U.
Citation
American Journal of Veterinary Research, 1984, 45, 10, pp 1989-1993
Abstract

In anthelmintic trials, albendazole, fenbendazole and ivermectin principally inhibited early fourth larval stages of O. ostertagi in naturally infected cattle. Cattle were slaughtered 7-20 days after treatment. O. ostertagi was the predominant abomasal nematode recovered with occasional small...

Author(s)
Snider, T. G.; Williams, J. C.; Knox, J. W.; Roberts, E. D.; Romaire, T. L.
Citation
Veterinary Record, 1985, 116, 3, pp 69-72
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

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

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

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