The oldest mention of mastitis known to me at this moment is a small remark in a very long report about the state of agriculture in the Kingdom of Holland in 1808. It may be found in Jan Kops' Magazijn der Vaderlandsche Landbouw, covering the whole of crops and animal production. Here we find a remark which goes as follows: “In Groningen it was especially unfavourable with cattle: during the summer it stayed healthy enough, except that in the Colonies [East-Friesland, annexed from Germany in Napoleontic times, BN] one was distressed by swollen udders…”[1]

In the Dutch text the word "jadders" (uiers) was used, a word related to the English "udders", but in Dutch it is not in use anymore.

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[1] Jan Kops: Magazijn van Vaderlandsche Landbouw vol VI, Haarlem, Loosjes, 1810, 118-119

To be consulted on the internet pages of Google: http://books.google.nl/books?id=U1RNAAAAcAAJ&printsec=frontcover&hl=nl&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false