This study was conducted with a view to the possibility of knowing the effect of exposing the hatching eggs before brood in hatcheries Magnetic field and see its impact on some reproductive traits. This study used 600 eggs for hatching breed (Rose 308) They were randomly divided in three replicates. It established ( 120) eggs to study the characteristics of embryonic development and 480 eggs to study the breed offspring, The exposure hatching eggs before incubation to the magnetic field intensity 18 mT (1800 Gauss) periods (zero, 15 ,30 and 45) minute gave the following indicators. The results indicated no significant effect (p≤0.05) of hatching eggs by exposing his lap when a magnetic field of the study of embryonic development during the first week of the incubator (Embryo weigh, Amnion, Chorio- Allantoic, Yolk Sac and its membrane, albumins, egg shell weight) The results showed significant superiority in length the embryo to relatively weighs in favor of treatments T2 and T4 . In the second week of embryonic development during incubation results showed no significant difference in recipes (Embryo weigh, Yolk Sac and its, albumins and egg shell weight), Significant increase in the proportion of liquid Chorio- Allantoic Embryo length ratios of weight in favor of the transaction T2, T3 and T4, and a significant decline in the percentage of transactions Amnion exposure to magnetic field T2, T3 and T4 . The results also indicated the lack of a significant effect of the percentage of egg weight loss during the first week and second week and day 18 of incubation in the hatchery and chick hatched weight the proportion of, While the treatment of T2 recorded a significant decline in the percentage of weight loss of eggs to show a magnetic field for a period (1-18 days) of incubation in the hatchery, significant increase in the ratio of length the chick hatched chick weight the proportion of in favor of treatment T3. The observed results decline a significant to mortality rate embryonic (1-6 days of incubation) in favor of treatment T3, significant increase in the mortality rate of embryonic (7-18) days recorded treatment T4, a significant decrease of the mortality rate of embryonic (19-21) days found in two treatments T3 and T4 , either in fetal mortality rate overall (1-21) days and the results showed a significant decline in favor of treatment T3, and for a significant decline in the proportion of whites clicking two treatments T3 and T4. The results showed a significant increase in the proportion of the total hatched eggs in favor of treatment T2 and hatched the proportion of fertilized eggs in favor of treatment T3. As for the different periods of hatched of the day (20-21) of hatching process results showed the superiority of a significant in the hatched the proportion of fertilized eggs of period (487 hours) for the treatment T4, and high a significant in hatchability of hours (494 hours) for the treatment of T2, and the superiority of a significant recorded T3 treatment of hatchability during the time (508 hours) from day 21 of the hatched period. The results indicated no significant effect of exposing the eggs hatching before his lap magnetic field on the chick hatched weight and the proportion of newly internal organs and edible palm, P.C.V % , hemoglobin, glucose and total protein. While it was observed and no significant increase in the concentration of blood calcium the proportion of in favor of the treatment T3 and T4 , a significant decrease in the concentration of cholesterol for the treatment of T4 compared to control.