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Veterinary Parasitology 2001-Apr

Screening of the anticoccidial effects of herb extracts against Eimeria tenella.

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H J Youn
J W Noh

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Ionophorous antibiotics have been popularly used in the treatment of avian coccidiosis. Tissue residue of these antibiotics may be found in poultry, we have sought safe alternative anticoccidial herbal materials for the control of avian coccidiosis. Efficacy of extracts from 15 different herbs, including Bupleurum chinese DC, Sophora flavescens Aiton, and Artemisia annua Linne was tested against Eimeria tenella. One-day-old broiler chicks were infected with a USDA reference book of E. tenella, and administered various herbal extracts. Survival rates, lesion scores, body weight gains, bloody diarrhea, and oocysts excretions were investigated at the first and the second week after infection. Bloody diarrhea in the S. flavescens and Sinomenium acutum treated groups was milder than that of the other infected groups. Survival rates in the groups treated with Ulmus macrocarpa (100%), Pulsatilla koreana, Torilis japonica, Artemisia asiatica and S. flavescens (90%) were higher than that of the infected control group (70%). Lesion scores in the groups treated with U. macrocarpa (1.40+/-1.14) or Pulsatilla koreana (1.60+/-1.82) were significantly lower than those of the infected control group (3.00+/-1.10). During the first week after infection, the weight gains in the groups treated with Quisqualis indica (232.9+/-43.5 g), S. flavescens (214.4+/-46.1 g) and S. acutum (211.3+/-29.4 g) were significantly higher than the infected control group (172.4+/-17.6 g). In conclusion, the data of the survival rates, bloody diarrhea symptoms, lesion scores, body weight gains and oocyst excretions indicate that the extract of S. flavescens was the most effective. P. koreana, S. acutum, U. macrocarpa and Q. indica were also effective. Further research on the above herbal materials will be carried out by the authors by chemical analysis of the extracts.

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