You will also need to include the SMI mibs:
http://www.juniper.net/techpubs/en_US/junos12.1/topics/concept/juniper-specific-mibs-junos-nm.html
[This for SRX as its the SMI for J/SRX]
Structure of Management Information MIB—Contains object identifiers (OIDs) for the security branch of the MIBs used in Junos OS for J Series and SRX Series devices, services, and traps. This MIB is currently supported by Junos OS for J Series and SRX Series devices only. For a downloadable version of this MIB, see http://www.juniper.net/techpubs/en_US/junos12.1/topics/reference/mibs/mib-jnx-js-smi.txt
[Plus this because it's the Juniper SMI]
Structure of Management Information MIB—Explains how the Juniper Networks enterprise-specific MIBs are structured. For a downloadable version of this MIB, see http://www.juniper.net/techpubs/en_US/junos12.1/topics/reference/mibs/mib-jnx-smi.txt
Regards,
Andy