The current study was carried out to study the effect of magnetic field, of 1 G intensity, on the male fertility parameters.This study was carried out in the laboratory of Biophysics, Facultyused for detection of pock lesions on the chorioallantoic membranes(CAMs) to confirm diagnosis of fowl pox. The skin lesions were described grossly and specimens fromsuch lesions were collected fixed in 100/0 neutral buffered formalinsolution and processed routinely for pathological examination. Five-micron thick paraffin sections were prepared and stained by Hematoxylin and Eosin besides the PAS-reaction for fungi and then examined microscopically. Thirty, 11 day-old embryonated chicken eggs were used toconfirm the disease on the chorioallantoic membrane (CAM) withO.2ml suspension of the affected tissue. After 5 days the embryos wereexamined for the deaths and plaque formation on the CAM.