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Eimeria tenella: sensitivity of recent field isolants to monensin
Avian Diseases
|January 1, 1978
Abstract:
Coccidia were propagated from litter samples obtained from broiler production flocks being medicated with monensin. Eimeria tenella was isolated from 48.9% of the litter samples from which coccidia were propagated. Tests of the monensin sensitivity of the 73 E. tenella isolants obtained revealed no monensin-resistant isolants.
Insights
Poultry coccidia, specifically Eimeria tenella, were studied in broiler flocks treated with monensin. No monensin-resistant strains of Eimeria tenella were detected in the sampled litter, indicating continued drug efficacy.
Area of Science:
- Veterinary Parasitology
- Poultry Science
- Antimicrobial Resistance
Background:
- Coccidiosis is a significant parasitic disease in broiler chickens.
- Monensin is a widely used ionophore anticoccidial drug in poultry production.
- Monitoring drug resistance in coccidia is crucial for maintaining flock health and productivity.
Purpose of the Study:
- To investigate the prevalence of coccidia in broiler litter.
- To determine the sensitivity of Eimeria tenella isolates to monensin.
- To assess potential monensin resistance in field isolates.
Main Methods:
- Coccidia were propagated from broiler litter samples.
- Eimeria tenella isolates were identified and quantified.
- Anticoccidial sensitivity testing was performed on Eimeria tenella isolates against monensin.
Main Results:
- Coccidia were successfully propagated from a significant portion of litter samples.
- Eimeria tenella was isolated from 48.9% of positive coccidia samples.
- All 73 tested Eimeria tenella isolates remained sensitive to monensin.
Conclusions:
- The study found no evidence of monensin resistance in Eimeria tenella isolates from medicated broiler flocks.
- Current monensin medication protocols appear effective against Eimeria tenella in the studied populations.
- Continued surveillance for anticoccidial resistance is recommended.