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Abstract
The faecal egg count reduction test (FECRT) was conducted on 39 sheep farms and 9
goat farms located in Peninsular Malaysia. The anthelmintic groups used in these tests
were the benzimidazoles, levamisole, the benzimidazole/levamisole combination, macrocyclic
lactones and closantel. Results indicated that the prevalence of resistance to the
benzimidazole group was high, with approximately 50% of the sheep farms and 75% of
the goat farms having resistant nematode parasite populations present. Resistance
to levamisole, closantel and ivermectin was also detected. Differentiation of the
infective larvae derived from faecal cultures indicated that by far the most predominant
parasite species was Haemonchus contortus.