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- W2022779228 abstract "These experiments determined if supplemental vitamins A and/or E would enhance ovine antibody responses. All-rac-alpha-tocopheryl acetate was fed to lambs approximately 6 months old (30 to 40 kg) at levels of 33 (controls), 121, 276, 396, and 476 mg/kg of feed (which are total vitamin E levels). Primary and secondary immunizations with 10 mg keyhole limpet hemocyanin (KLH) were given. A nonlinear dose response of serum antibody titers was observed and the 476 mg vitamin E/kg treatment significantly enhanced (P less than 0.05) the peak primary response over controls. Retinyl acetate fed at five levels ranging from 7000 (the control level) to 97,400 IU/kg feed failed to influence antibody production to 10 mg KLH of lambs about 6 months old (29 to 41 kg). There was no detectable response to an ovalbumin antigen (100 mg). Neonatal lambs were injected with retinyl palmitate or the carrier of the injected vitamin. These lambs failed to raise antibody titers to either of the antigens administered (10 mg KLH, 100 mg ovalbumin). This was apparently due to a neonatal period of immune paralysis to certain antigens. A preliminary study showed that no KLH-specific antibodies are detectable in lambs immunized earlier than 7 weeks of age. Lambs in this age range were utilized in the last trial in which four treatments were applied: 3000 mg oral vitamin E, 400,000 IU injected vitamin A, 4 ml of the injectable vitamin A carrier, or no treatment. Half of the animals in each of these groups were immunized with 15 mg KLH and 1 ml Brucella ovis bacterin and the other half served as nonimmunized controls. No significant differences in titers to KLH were observed. Lambs receiving 3000 mg vitamin E or the carrier produced secondary peak anti-B. ovis titers higher (P less than 0.05) than those of the untreated controls." @default.
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- W2022779228 date "1986-07-01" @default.
- W2022779228 modified "2023-09-23" @default.
- W2022779228 title "The Influence of Supplemental Vitamins A and E on Ovine Humoral Immune Response" @default.
- W2022779228 doi "https://doi.org/10.3181/00379727-182-42357" @default.
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