In the first season, the equipment was supplied by Martin Archery (their name appears in the end credits of each episode). You can see Luke using a Martin Cougar in the opening scene of 'Daisy's Song' (below). If I remember correctly, Bo's bow was a Martin Warthog.
Luke's is a Martin Cougar II
Bo's is a Martin Warthog
arrows were also supplied by Martin.
Martin supplied bows throughout the series and they change a bit through the years.
I can't seem to find my link, but somewhere on line the guy from Martin talks about getting the bows put together at the last minute for the TV show (short notice) , you won't find a warthog or a cougar II with the writing like that on the limbs, it was literally added with K-mart mailbox lettering on the way to bring them to filming to get the Martin name on there for the show.
I nearly forgot Germany where it's called 'Ein Duke Kommt Selten Allein', literally 'A Duke Rarely Comes Alone' (again, Google just translates it as 'Dukes of Hazzard'). I can't find a German intro/theme tune, so I'm guessing they use the one with Waylon.