The seasonal incidence of helminth infestation on a farm in the Transvaal Highveld was determined by the slaughter of tracer lambs exposed on pasture for periods of approximately 6 weeks. Haemonchus contortus, the most prevalent nematode, was recovered in the greatest numbers from January--May 1974. Peak counts of Ostertagia circumcincta were made during March and April 1974 and in January 1975...

In India, small ruminants contribute in providing economic security to small, landless and marginal farmers. Parasitic diseases are important cause of production losses in small ruminants the world over. Of these, gastrointestinal (GI) nematodosis is a common parasitic infection of small ruminants in India including sub-Himalyan region of northern India (Yadav et al., 2009). It is caused by mix...

A genetically diverse population of Haemonchus contortus was serially passaged through Merino hosts bred for either increased or decreased resistance to the parasite. After 30 parasite generations, the resulting nematode sub-populations were compared with each other and with the foundation population, by infecting lines of the selected sheep and measuring the resulting faecal egg counts (FECs) ...

A cambendazole-resistant (CR) strain of Haemonchus contortus, the large stomach nematode of sheep, had similar in vitro growth characteristics compared to the parent strain (BPL). When the in vitro cultivation system was modified to detect drug resistance: (1) exsheathed infective larvae of the BPL strain did not develop in a culture medium with a concentration of 2.5 /ug/rnl thiabendazole (TBZ...

An investigation to determine the prevalence and distribution of gastrointestinal roundworms in calves in Sokoto metropolis was carried out. A total of 216 faecal samples from calves were examined using Modified McMaster technique for morphological egg differentiation and count of worm-egg per gram of faeces of the sampled calves. Positive samples were cultured to differentiate between morpholo...

Sixty plant species were collected in the Ivory Coast on the basis of an ethnobotanical literature using the following three criteria: activity against worms, diarrhoea and/or abdominal pain. Eighty six plant extracts were prepared using 90% ethanol and tested for potential anthelminthic activities with a larvicidal test of Haemonchus contortus. 25.6% of the extracts showed a high activity, 12....

To determine association of grassland with parasitic diseases of livestock in Bangladesh, the 'Tracer' animals (two cow calves and two goats) were released for a month in a grassland used for communal grazing of livestock near school premise in Kanthal, Trishal, Mymensingh, Bangladesh. After slaughtering of the tracer animals, their gastrointestinal tract examination revealed six species of nem...