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Abstract
This work aimed to study the effect of infection of ducks with E. coli 078 and Slmonella enteritidis or both at different ages with different routes. Also evaluation of probiotics in treatment and prevention of these infections in comparison to antibiotic
This work was divided into 5 experiments:
1- Experiment 1:
In which we studied the effect of experimental infection with Salmonella enteritids with different routs at 5th and 13th days of age mortality ranged from 0-20%, subcutaneous and intratracheal infection was the highest. All infected birds showed a significant reduction in body weight ranged from 13.8 - 21.3% and decrease in FI and decrease in FCR in comparison to infected non treated group. Salmonella infection results in decreased immune response after vaccination with HB1. Bacterial count in these groups ranged from (6.3 + 0.33) to (4.8 + 0.51).
On using Biomin, Ciproflexacin or combined treatments, all birds showed an improvement in body weight. Biomin improved the immune response to reach up to the control level while Ciprofloxacin alone or combined with Biomin results in more decrease in the immune response to ka-sota vaccination.