Evaluation of Humoral Immunity to Infectious Bronchitis and Newcastle Disease Vaccines and Received Artemisia herba alba Extract in layer hens

The present study aims to evaluate the effect vaccination and oral administration of aqueous extract of artemisia herba alba on the immune status.forty laying hens (Lohman Brown,1 year-old, body weight 1.8 kg) were divided into four groups (ten) individuals.First one is the control; the second group treated with vaccine against NDV and IBV; third g

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