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Published on: February 20, 2015
Anticoccidial Resistance in Eimeria spp. From Thai Broiler Farms Using Shuttle Programs
Suttitas Tongkamsai1, Siraprapa Boobphahom2, Rachan Apphaicha1
1Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-ok, Chonburi, 20110, Thailand, rmutto.ac.th.
Veterinary Medicine International
|May 25, 2026
Summary
Poultry coccidiosis in Thailand shows moderate resistance to common anticoccidials like salinomycin and maduramicin. This necessitates strategic drug rotation and alternative control methods for sustainable broiler production.
Area of Science:
- Poultry Health and Disease Management
- Parasitology and Veterinary Entomology
- Antimicrobial Resistance Studies
Background:
- Coccidiosis, caused by Eimeria species, is a major poultry disease impacting broiler productivity.
- Widespread use of anticoccidials, particularly in Thailand's shuttle programs, has led to significant drug resistance.
- Understanding resistance profiles is critical for effective coccidiosis control strategies in poultry.
Purpose of the Study:
- To assess the sensitivity of Thai Eimeria field isolates to commonly used anticoccidial agents.
- To evaluate the efficacy of salinomycin and maduramicin against Eimeria acervulina, E. maxima, and E. tenella.
- To provide data for developing sustainable coccidiosis prevention strategies in Thai broiler production.
Main Methods:
- Conducted anticoccidial sensitivity tests (ASTs) on Eimeria isolates from Thai broiler farms.
- Utilized four key indices: ACI, POAA, RLS, and ROP for sensitivity assessment.
- Employed a dose-titration trial and histopathological analysis to evaluate drug efficacy and infection severity.
Main Results:
- Field isolates exhibited moderate resistance to both salinomycin and maduramicin, based on composite index analysis.
- While treatments reduced lesion scores and oocyst shedding, efficacy was incomplete, indicating persistent Eimeria colonization.
- Discordant results among sensitivity indices highlight the complexity of assessing anticoccidial resistance.
Conclusions:
- Thai Eimeria field isolates demonstrate moderate resistance to key anticoccidials used in broiler shuttle programs.
- Current drug efficacy is compromised, necessitating a re-evaluation of control strategies.
- Urgent implementation of strategic drug rotation, vaccination, and bio-shuttle programs is recommended for sustainable poultry production.
