Anthelmintic Resistance in Gastrointestinal Nematodes of Sheep and Goats
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Date
2004
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Publisher
TANUVAS, Chennai
Abstract
The occurrence of anthelmintic resistance on four organized
sheep and goat farms and eight smallholder sheep flocks in Western
and Southern Tamil Nadu was undertaken. Resistance in
gastrointestinal nematodes to benzimidazole was detected by a
combination of Faecal Egg Count Reduction Test (FECRT) and Egg
hatch Assay (EHA), Larval Migration Inhibition Assay (LMIA) and
Larval Development Assay (LDA) and resistance to levamisole by a
combination of FECRT, LMIA and LDA. Gastrointestinal nematodes
resistant to benzimidazoles and levamisole were present in sheep at
Southern Regional Research Centre (SRRC), Mannavanur and Sheep
Breeding Research Station (SBRS), Sandynallah and in sheep and
goats at Veterinary College and Research Institute (VCRI), Namakkal.
Haemonchus contortus was the nematode associated with resistance in
sheep at SRRC, Mannavanur and in sheep and goats at VCRI
Namakkal. In SBRS, Sandynallah, the predominant nematode
associated with resistance was Teladorsagia circumcincta. Resistance
was not detected in Haemonchus contortus in goats at MSRS,
Pottaneri. Resistance in H. contortus to benzimidazoles was not
detected in four smallholder farmer’s flocks. There was good
agreement in results obtained between in vivo and in vitro assays.
Gastrointestinal nematodes that were present in the order of
prevalence include H. contortus, Trichostrongylus colubriformis,
Cooperia species and Oesophagostomum columbianum in the plains
and Teladorsagia (Ostertagia) circumcincta, H. contortus, Cooperia spp.,
Nematodirus spp. and O. aspersum in the hills.
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Keywords
Veterinary Science, Veterinary Parasitology