The general lines of diachronics of Lombard and Piedmontese plural declension are drawn here:
Contents
Feminine
In the Lombard languages and in Piedmontese, feminine plural is generally derived from Latin first declension accusative -as; nouns from other classes first collapsed there; some concrete realisations are:
Masculine
On the contrary, masculine plural is generally derived from Latin second declension nominative -i; this desinence eventually drops or gives rise to palatalisation or metaphonesis; some concrete realisations are:
References
Diachronics of plural inflection in the Gallo-Italian languages Wikipedia(Text) CC BY-SA