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Abstract

Thirty-five beef calves naturally infected with gastro-intestinal nematodes (including Bunostomum phlebotomum in about one third of the animals) were exposed percutaneously to B. phlebotomum (30 infective larvae/ kg body weight). Between 59 and 66 days later, when 30 animals had B. phlebotomum eggs ...

Author(s)
Williams, J. C.; Baumann, B. A.; Hoerner, T. J.; Knox, J. W.; Snider, T. G.; Fredotovich, V. M.
Citation
American Journal of Veterinary Research, 1983, 44, 9, pp 1644-1647
Abstract

Albendazole, as a paste formulation, was evaluated for its efficacy against inhibited early fourth stage larvae of Ostertagia ostertagi in naturally infected, yearling beef cattle in April. The mean number of inhibited larvae in 11 untreated control cattle was 107,166. At the dosage level of 7.5 mg ...

Author(s)
Williams, J. C.; Knox, J. W.; Sheehan, D.; Fuselier, R. H.
Citation
Veterinary Record, 1979, 105, 5, pp 98-100
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

Four groups of 17 crossbred beef weaners were used in an experiment which extended from 14 November 1985 to 8 October 1986 (328 days). All groups began grazing on separate, contaminated pastures at a stocking rate of 5.3 cattle/ha and the different treatments were: Group 1, ivermectin injectable ×...

Author(s)
Williams, J. C.; Knox, J. W.; Marbury, K. S.; Swalley, R. A.; Willis, R. E.
Citation
Veterinary Parasitology, 1989, 33, 3-4, pp 265-281
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

The results of work in Louisiana, USA, on the seasonal incidence of inhibited 4th-stage larvae of Ostertagia ostertagi, and on the efficacy of albendazole against this parasite, are recapitulated. [See also Hm/A 47, 2212; 49, 2699]

Author(s)
Williams, J. C.; Knox, J. W.
Citation
Livestock Producers' Day, Louisiana Agricultural Experiment Station, USA, 1979, No.19, pp 182-189
Abstract

3 groups of 17 Angus × Hereford steers were used to evaluate effects of strategic anthelmintic treatment on safe (group 1) and contaminated (group 2) pasture (in Louisiana, USA) in comparison with minimal treatment at weaning and contaminated pasture (group 3). The investigation extended from...

Author(s)
Williams, J. C.; Knox, J. W.; Marbury, K. S.; Kimball, M. D.; Scheide, S. W.; Snider, T. G.
Citation
Research in Veterinary Science, 1988, 45, 1, pp 31-40
Abstract

In experiments from November 1986 (weaning) to October 1987, group-1 calves (18 in each group) were treated with ivermectin (200 µg/kg of body weight, s.c.) at approximately 6-week intervals for a total of 8 treatments; group-2 calves were given the same dosage of ivermectin by the same route of...

Author(s)
Williams, J. C.; Knox, J. W.; Barras, S. A.; Hawkins, J. A.
Citation
American Journal of Veterinary Research, 1990, 51, 12, pp 2034-2043
Abstract

Author(s)
Knox, J. W.; Williams, J. C.
Citation
Journal of Animal Science, 1979, 49, Suppl. 1, pp 193
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

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