Background: Gastrointestinal nematodes (GINs) can cause significant economic losses in alpacas due to lowered production of fibre and meat. Although no anthelmintics are registered for use in alpacas, various classes of anthelmintics are frequently used to control parasitic gastroenteritis in...

The objective of this study was to evaluate the status of anthelmintic resistance (AR) in ruminants and horses in Spain. The efficacy of commonly used macrocyclic lactones (MLs) - ivermectin (IVM) and moxidectin (MOX) - was measured in sheep, cattle and horses. In addition, albendazole (ABZ) and...

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 ...

Two experiments with a morantel resistant strain of O. ostertagi were carried out. In the first experiment, 5 groups of 5 calves were infected with 60 000 larvae of this resistant strain. Calves of one group remained untreated, calves of the other groups were treated with morantel tartrate,...

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 ...

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...

In five trials conducted in different regions of France during 1988, 15-21 calves given the morantel tartrate bolus were introduced to contaminated pasture plots as were similar numbers of control calves and, in two trials, similar numbers of calves given a levamisole bolus. Monthly faecal egg...

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...

44 parasite-free calves of Friesian type were assigned to 4 groups of 6 and 4 groups of 5 calves. At 12-weeks-old, 2 groups of 6 were given a bolus containing 22.2 g of levamisole. One treated group and one group of 6 untreated calves were put out to graze on May 1 in separate paddocks of a field...

The effect of a slow release intraruminal bolus containing 22.2 g levamisole was tested in 5 Friesian type calves reared indoors until 12 weeks old. 5 similar calves were used as controls. All 10 calves were infected twice weekly for 6 weeks with 2500 Ostertagia ostertagi and 2500 Cooperia...