iOS Do I need to keep iOS Push Services certificates in my Keychain Access?

Hi, I just wonder whether I should keep these production and development iOS Push Services certificates in my keychain that were used to configure push notifications for my projects. All server configurations are done and the apps are receiving push notifications. I understand that I would have to re-export them and upload them to servers if I get to reconfigure servers. Apart from that, are there any other reasons to keep them in my Keychain Access? Are they being used when I build the project?