Abstract:
Aim_x000D_
To study the impact of intermittent administration of an Echinacea-based preparation (EBP) in broilers on performance and immunomodulation against a multivalent challenge by four species of Eimeria and C Perfringens._x000D_
Methods and Results_x000D_
A total of 60 day-old Cobb birds were divided into three treatments, with 20 birds per each. Birds of Treatment 1 were administered the EBP intermittently at the ages of 1-3, 8-10, 15-17, and 22-24 days, standardized at 0.44 mg alkamides/liter of drinking water, while deprived of challenge. Birds of Treatment 2 were similarly treated with EBP, followed by an intra-esophageal challenge at 28 d of age with four Eimeria spp and 106 cfu of C perfringens/ml/bird. Birds of Treatment 3 were deprived of EBP treatment and administered the same challenge at 28 d of age. Results showed that birds of Treatment 2, and at the end of the first life cycle of Eimeria (34 days of age) had higher average weight gain, lower means of oocyst count and intestinal lesion score, a reduction in transcribed IL-8 chemokine produced by the Intraepithelial lymphocytes (IEL) of the duodenum (p < 0.05), ileum (p < 0.05), and cecum (p > 0.05), associated with higher serum nitrite at challenge age (28 d.), compared to birds of Treatment 3._x000D_
Conclusions_x000D_
The EBP-treatment was able to improve the weight gain during the incubation period of the challenge, reducing the multiplication of oocysts and associated lesion score, and increasing the plasma nitrite, while reducing the IL-8 generated by intestinal IEL._x000D_
Significance and Impact of Study_x000D_
This study provides a data that will pave the way for future transformation in poultry practices towards the use of immunopotentiators in control of economic poultry coccidiosis, in attempts to comply with the customers demand for safe poultry products that are devoid of synthetic coccidiostat residues.
