Abstract

A considerable interest has bean shown in the effects of vaccination or early exposure of chicks on subsequent egg transmission of Mycoplasma gallisepticum. Previous work has shown that there is a marked reduction in egg transmission following exposure of chicks at 1 day old or 14 days old (5). Complete immunity was not present. This was based on the ability to isolate M. gallisepticum from the trachea during the experimental period of approximately one year. Following these results a breeding flock of approximately 1200 New Hampshire and Dominant White birds was available for study. In addition to observing the effects of vaccination on egg transmission, the establishment of a clean flock was attempted.

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