Thanks Adler, I guess most of the Udet Geschwader's claims are from their killing sprees in Russia during 1941-42, same story for JG 5, in particular the II. and III. Gruppen with Bf 109s in Finland and on the northern fronts.
It would be interesting to know some claims per Gruppe. I know that III./JG 3, II./JG 53, I./JG 77 and I./JG 27 had some really high scores, more than 1000 a piece. I also know that III./JG 52 had over 3,500 kills in March 1944, so their total score by war's end should be even higher.