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Abstract

The anthelmintic resistance of bovine nematodes against ivermectin was determined in 2 farms in southern Chile. A total of 14 and 22 bovines aged 7-8 months from farms 1 (near Purranque) and 2 (near San Pablo), respectively, were treated with 0.2-ml/kg ivermectin. Faecal samples were obtained from...

Author(s)
Sievers, G.; Alocilla, A.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2007, 39, 1, pp 67-69
Abstract

Naturally infected cattle from a farm in Chile were divided into control (placebo) and experimental (3 types of ivermectin and 1 each of moxidectin, abamectin and doramectin, each at 0.2 mg/kg) groups for the treatment of Ostertagia ostertagi, Trichostrongylus and Cooperia spp. infections. Faecal...

Author(s)
Sievers, G.; Fuentealba, C.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2003, 35, 1, pp 81-88
Abstract

A study was undertaken to determine which section (upper or lower) of grass is preferred by infective larvae (L3) of Trichostrongylidae of cattle and whether the larvae show a diurnal vertical migration pattern on the grass. Weekly grass samples were taken from a 0.6 ha pasture with calves, from a...

Author(s)
Sievers, G.; Quintana, I.; Cortese, F.; Ernst, S.
Citation
Archivos de Medicina Veterinaria, 1998, 30, 1, pp 47-54
Abstract

The trial was carried out in a dairy farm in Valdivia, southern Chile, from April to July 1989. Of 40 grazing heifers weighing around 248 kg 10 were injected s.c. with 7.5 mg/kg levamisole, 10 received 7.5 mg/kg spot-on levamisole, 10 were drenched with 8 mg/kg, and 10 were untreated controls....

Author(s)
Sievers, G.; Guzmán, O.
Citation
Archivos de Medicina Veterinaria, 1991, 23, 1, pp 41-48
Abstract

The study was carried out between October 1992 and March 1993 in 20 Holstein Friesian calves, with an initial mean body weight of 133 kg, which had acquired a normal parasitosis after a month of grazing. Helminth eggs in faeces were counted on 19 occasions. Body weight of the calves was recorded on ...

Author(s)
Sievers, G.; Cárdenas, M.; Quintana, I.
Citation
Archivos de Medicina Veterinaria, 1995, 27, 2, pp 105-110
Abstract

In central Chile, pasture plots were experimentally contaminated with faeces from 3- to 6-month-old calves at monthly intervals for one year. The most frequent genera were Trichostrongylus and Cooperia, and both had a similar pattern of density and survival over the year. The most favourable period ...

Author(s)
Cattan, P.; Grumberg, J.; Valderas, J.; Palavicino, J.
Citation
Parasitologia al Día, 1984, 8, 3, pp 68-72
Abstract

15 calves in Chile were protected from the adverse effects of helminthoses when dosed with febantel (5 mg/kg body weight) 32 and 70 days after grazing a pasture contaminated with species of Ostertagia, Cooperia and Nematodirus.

Author(s)
Sievers, G.; Quintana, I.
Citation
Veterinary Medical Review, 1983, No.2, pp 182-188
Abstract

Grazing calves treated with 2.5 mg oxfendazole/kg body weight at 29, 58, 96 and 135 days after the start of grazing, when number of eggs/g faeces exceeded 200, excreted 80% fewer eggs than untreated control calves. The predominant helminth was Ostertagia spp. (98.6 and 98.5% in untreated and...

Author(s)
Sievers, G.; Cruz, L.
Citation
Praktische Tierarzt, 1981, 62, 10, pp 861-862, 864
Abstract

Author(s)
Sievers, G.
Citation
Fourth International Congress of Parasitology, 19-26 August 1978, Warszawa, Short Communications, Section C., 1978, pp 168

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