The magnetic and transport properties of the doped manganites colossal magnetoresistive (CMR) compounds with the perovskite structure are mainly characterized by a competition between ferromagnetism and antiferromagnetism, and between a metallic and insulator behavior. The effects of the magnetic and transport measurements of the CMR compound have been investigated by different DC and AC techniques. The magnetic and transport behavior of La1-xCaxMnO3+ (x=0.48, 0.50, 0.52 and 0.55 and =0.015) compositions close to charge ordering, was studied through resistivity DC magnetization and AC...