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  • Title: Use of corticosterone and ampicillin for treatment of Streptococcus faecalis infection in chickens.
    Author: Gross WB.
    Journal: Am J Vet Res; 1991 Aug; 52(8):1288-91. PubMed ID: 1928910.
    Abstract:
    Chickens were selectively bred for either high-antibody (HA) or low-antibody (LA) response to sheep erythrocytes. From 6 to 31 days after Streptococcus faecalis challenge exposure, LA-line chickens maintained a greater percentage of the prechallenge-exposure body weight and had lower heterophil-to-lymphocyte ratio than did HA-line chickens. The optimal dose of corticosterone (30 mg/kg of feed) was effective in maintaining postchallenge-exposure body weight greater than that of controls. Ampicillin (20 mg/d) alone was ineffective in almost all experiments. Treatment with 30 mg of corticosterone/kg of feed plus ampicillin resulted in increased body weight response to S faecalis infection when treatment was initiated 1 day before or 2 days after challenge exposure. Treatment with corticosterone was more effective in HA- than in LA-line chickens. Treatment before challenge exposure was more effective than treatment 2 days after challenge exposure.
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