exudates and Trichostrongyloidiasis

The prevalence of drug-resistant parasites in goats in West Malaysia has rarely been reported. Ten commercial goat farms were surveyed for resistance to anthelminthics by measuring the reduction in faecal egg counts (FECs) after treatment with levamisole, pyrantel pamoate and fenbendazole. Resistance to fenbendazole was seen in most farms; there was no evidence of resistance to levamisole but some resistance to pyrantel pamoate was detected on one farm. The significance of the findings are discussed.

Topics: Animal Husbandry; Animals; Anthelmintics; Drug Resistance; Goat Diseases; Goats; Haemonchus; Malaysia; Oesophagostomum; Trichostrongyloidea; Trichostrongyloidiasis; Trichostrongylus

Faecal worm egg counts of goats from two farms in Penang Island, West Malaysia, were monitored over a period of 14 months. The faecal egg count pattern followed that of total rainfall. The humid tropical environment was favourable for the development of various species of trichostrongylid nematodes, namely Haemonchus contortus, Trichostrongylus spp., Oesophagostomum spp. and Cooperia spp. Generally, H. contortus was observed to be the predominant species, more so in the monsoon months of the year.

Topics: Animals; Feces; Goat Diseases; Goats; Intestinal Diseases, Parasitic; Larva; Malaysia; Parasite Egg Count; Rain; Seasons; Trichostrongyloidea; Trichostrongyloidiasis

An investigation into the seasonal changes in the population structure of Haemonchus and Trichostrongylus in tracer goats was conducted over 12 months at Serdang, an area in southern West Malaysia with year-round tropical rainfall. Successive groups of parasite-free tracer goats were grazed for a month alongside naturally infected adult goats and necropsied for worm counts 14 days after their removal from pasture. No hypobiotic larvae of Trichostrongylus were recovered. Hypobiotic larvae of Haemonchus were evident during each month of the year but accounted for only a very small proportion of the total Haemonchus burden. Very low levels were encountered from December through to June. Comparatively higher levels of hypobiosis were observed thereafter with a peak of 7.4% in September. The factors responsible for hypobiosis were not clearly defined but the phenomenon was associated with increasing levels of soil moisture storage. Host resistance, adult worm population of tracers and population of ingested L3 were ruled out as possible inducing factors.

Topics: Animals; Goats; Haemonchiasis; Larva; Malaysia; Seasons; Trichostrongyloidea; Trichostrongyloidiasis

Topics: Animals; Feces; Female; Intestine, Small; Larva; Liver; Locomotion; Lung; Malaysia; Male; Rats; Stomach; Trichostrongyloidea; Trichostrongyloidiasis