Effects of Gan lian Yu ping feng powder on the antibody titers to infectious laryngotracheitis vaccine and some nonspecific immune indexes in chickens.

The study was conducted in order to investigate the immuno-enhancing property of the Chinese herbal formula, Gan lian Yu ping feng powder. Three hundred and thirty six 45-day-old chicks were randomly divided into eight groups. The chicks in groups A, B, C were orally given 0.