This may seem obtuse of me but is most cheese made by using calf rennet
Not an obtuse Q at all. I actually emailed Coon cheese regarding their chees & this is the email I received back from them (as my partner insists he "needs" dairy to get his calcium requirements as he doesn't believe dairy actually leaches calcium from his bones)
"Thank you very much for your recent contact regarding our Coon cheese.
We wish to advise that if in the ingredient statement “Enzyme (rennet)” or “Rennet” is quoted then it is animal rennet (from a cow source).
Otherwise “Enzyme” it is non-animal / microbial source.
We trust this information is useful to you. Once again, thank you for contacting National Foods."