A total of 182 sara samples were collected from two sheep breeds (mixed and Barki sheep) as well as goats raised under arid conditions and examined by serum neutralization test (SNT) for neutralizing antibodies of PPR and RP viruses. The results showed that at 1:4 serum dilution, 29.41% of mixed breed sheep, 29.82% of Barki sheep and 29.82% of goats sera contained antiboudies to PPR virus, while 2.9%, 12.28% of the two sheep breeds respectively and 7.0% of goats sera have antibodies to RP virus. It could be concluded that the prevalence of neutralizing antibodies to PPR virus is equal in sheep and goats. No signifcant difference between the two sheep breeds tested for PPR virus antibodies, but RP virus antibodies was higher in the sera of Barki sheep than that of the mixcd breed sheep. and the antibodies for PPR virus in the two sheep breeds were more prevalent than in goats.