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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

Persistence of ivermectin anthelmintic activity in injectable and pour-on formulations against experimental infections of gastrointestinal nematodes in cattle was investigated in 5 groups of 6 calves each. Two groups were treated with the injectable or pour-on product at 14 days before experimental ...

Author(s)
Williams, J. C.
Citation
Louisiana Agriculture, 1992, 35, 5, pp 15-18
Abstract

Three groups of 11 naturally infected crossbred beef calves were injected subcutaneously with moxidectin 1% injectable at 0.2 or 0.3 mg moxidectin/kg bodyweight or with the unmedicated vehicle. Nematode infections had been acquired during grazing from December to April. Based on the faecal egg...

Author(s)
Williams, J. C.; Barras, S. A.; Wang, G. T.
Citation
Veterinary Record, 1992, 131, 15, pp 345-347
Abstract

Efficacy of a spring strategic treatment programme with fenbendazole (FBZ) to reduce the accumulation of Ostertagia ostertagi inhibited early fourth-stage larvae (EL4) was investigated in two groups of crossbred beef heifers in Louisiana, USA, which were 7-9 months of age and ranged in weight from...

Author(s)
Williams, J. C.; Loyacano, A. F.; Broussard, S. D.; Coombs, D. F.; DeRosa, A.; Bliss, D. H.
Citation
Veterinary Parasitology, 1995, 59, 2, pp 127-137
Abstract

Twenty crossbred beef heifer calves were used for an efficacy evaluation of 0.5% moxidectin pour-on against gastrointestinal nematodes and Dictyocaulus viviparus. The latter parasite and Bunostomum phlebotomum were the target species. The calves were exposed to natural infection on pasture from...

Author(s)
Williams, J. C.; Broussard, S. D.; Wang, G. T.
Citation
Veterinary Parasitology, 1996, 64, 4, pp 277-283
Abstract

Three groups of 30 crossbred beef steers, 8-10 months of age and ranging in weight from 158 to 320 kg, were used to compare effects of treatment with an ivermectin sustained-release bolus or 2 ivermectin injectable treatments on parasite control and productivity in relation to untreated controls...

Author(s)
Williams, J. C.; Loyacano, A. F.; Broussard, S. D.; Coombs, D. F.
Citation
Veterinary Parasitology, 1995, 58, 1/2, pp 75-82
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

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

The anthelmintic efficacy of abamectin (avermectin B) was evaluated against gastrointestinal nematodes, including O. ostertagi inhibited larvae and lungworm, in yearling crossbred beef heifers in Louisiana, USA, during late spring. The calves were grazed on contaminated pasture for 10 weeks and...

Author(s)
Williams, J. C.; Loyacano, A. F.; Nault, C.; Ramsey, R. T.; Plue, R. E.
Citation
Veterinary Parasitology, 1992, 41, 1-2, pp 77-84

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