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...

The purpose of this study is to evaluate whether Plantago lanceolata (narrow leaf plantain), as a supplemental forage, reduces the egg output of gastrointestinal nematodes in calves. The trial was conducted on a farm in the 10th Region, Chile. Two groups of 15 calves weighing 171.4±19.8 kg grazed...

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...

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...

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....

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 ...