transfer from calibre to iPad?

I apologise in advance if this is the wrong place to post.

My main hobby is designing ebooks, mostly for the MobileRead library, and I like to test the ebooks on a range of ereaders before uploading them to the library. I can easily download the ebooks from my calibre library to my Sony, Kobo, and Kindle readers, and with Calibre Companion to my lenovo tablet.

Is there a way, a plugin perhaps, that I can use to transfer them from my calibre library to my iBooks on my iPad?