Studies were carried out between 12 June 1998 and 6 March 1999 in Mato Grosso do Sul, Brazil, to investigate the effects of ivermectin, moxidectin and doramectin to control helminths in 100 Brangus heifers. Animals grazed on Brachiaria decumbens pastures and were treated with 1 ml/50 kg liveweight...

The efficacy of doramectin (200 mg/kg) against intestinal nematodes in 10 Nelore heifers was studied; 10 further cattle served as untreated controls. From days 14 to 18 after treatment 2 animals from each group were necropsied and examined for nematodes. The results showed that the treatment was...

A review of recent work on gastrointestinal nematodes of cattle (chiefly Zebu and Nelore) and their control by anthelmintics at Campo Grande, Rio Grande do Sul, in the savanna region of Brazil, is given. The commonest nematodes are Cooperia spp. and Haemonchus spp., especially H. similis which...

An evaluation was made of the influence of the peri-parturient period on the counts of eggs of nematodes in the faeces of beef cattle. Thirty-two Nellore pregnant cows were used, of which 8 were with the first calf, 12 with the second and 12 with the third calf, all calving in October. To determine ...

During 3 experimental periods each of one year (from 1972 to 1976) the numbers of gastrointestinal nematodes in 2 groups of calves, reared on the savanna of Mato Grosso, Brazil, were assessed by faecal and post-mortem examinations. One group of calves was naturally infected (untreated) and the...