Abstract
Faecal samples from 140 adult goats were collected and positive samples were examined quantitatively; goats having at least 500 eggs/g of faeces were selected and randomly divided into four groups. Faecal egg count reduction test was used to detect the efficacy of albendazole (ALB), levamisole (LEV) and ivermectin (IVM) in goats naturally infected with gastrointestinal nematodes in a semi-organized farm located in semi-arid region of Gujarat, India. ALB, LEV and IVM reduced faecal egg counts on 14th day post-treatment varied from 53% to 76%, revealing presence of resistance of worms to all these drugs. Finding IVM resistance in gastrointestinal nematodes is found to be alarming. Pre-treatment faecal culture of all the groups collectively revealed Haemonchus spp. as the predominant parasite again post-treatment faecal cultures further emphasize the pre-dominance of H. contortus in ALB- and LEV-treated groups. However, faecal cultures from IVM-treated group revealed predominance of Trichostrongylus species which were scarce in pre-treatment group. Study further reveals that only ALB was found to be effective against Oesophagostomum spp., and most of the gastrointestinal nematodes were found to have some degree of resistance against rest of the other drugs used in goats.
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