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OJVRTM
Online Journal of Veterinary
Research©
Volume 19(2): 102-107, 2015.
Emergence of anthelmintic resistance
in naturally infected goats in Tamil Nadu, India.
A. Varadharajan
MVSc and R. Vijayalakshmi
PhD.
Division of Animal husbandry, Faculty of Agriculture, Annamalai University, Annamalai
Nagar – 608 002. Tamil Nadu, India. varadharajanah@gmail.com
ABSTRACT
Varadharajan A, Vijayalakshmi R., Emergence
of anthelmintic resistance in naturally infected goats in Tamil Nadu, India, Onl J Vet Res., 19(2): 102-107, 2015. Faecal
egg count reduction tests were conducted on goat flocks in Cuddalore, Tamil Nadu, India, to determine the efficiency of fenbendazole, levamisole and ivermectin
given at recommended doses against nematode parasites. Untreated mixed
sex, 5-15 mth old goats were naturally infested on
pastures for 2 months. After, faecal egg counts were done on day 0 before
treatment and 10 days later. At day 0 all goats were positive to parasites but
by day 10, fenbendazole had reduced egg counts 74 to 91%, levamisole
90% and ivermectin 96 to 99% in the areas. Post-treatment
fenbendazole and levamisole fecal
culture revealed Haemonchus contortus
larvae. Findings show that resistance occurred
mainly in organized farms with intensive anthelmintic
treatment schedules, not in small farms. Results suggest that resistance to
fenbendazole and/or levamisole could have developed due
to prolonged intensive underdosing. Ivermectin has only
been recently used in the area and its use is not widespread.
(Key Words: Anthelmintic resistance, goats, Cuddalore).
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