Can we make isoglosses?

[Bernd]

Note the thin scribal mark between i and ch of "gaismich". It is nowhere else in the entire text. Could it indicate a missing letter?

Unfortunately the St. Pölten document with "Gaisiunge" is not digitized yet
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@Anton
The idea that these words represent some holiday or season is tempting but I doubt it has anything to do with Capricorn and such date-dependent taxes would pop up regularly like with chickens. It would have been "Geiss "though, "Ziege" is not Bavarian and only introgressed from the north much later.

Mostly it's just the number of geese mentioned in documents or the fact that they had to be fattened, nothing else. Also taxes were not collected at or before Christmas, this would have been seen as indecent. Apparently geese were collected as tax on different but specific dates in summer like Aug.15 (Ascension of Mary), Aug. 24. (St. Bartholomy), Sept. 1 (St. Giles) and this probably varied both locally and over time. However it appears there was only one collection date per year, not two like for chickens. You can search for "Gänsezehent".

I still have zero idea what gaismich or gaisiunge might mean.