The third link for Frisian doesn't mention cattle either:
"Frisian [ˈfrɪʒən], Friesian
n
1. (Linguistics / Languages) a language spoken in the NW Netherlands, parts of N Germany, and adjacent islands, belonging to the West Germanic branch of the Indo-European family: the nearest relative of the English language; it has three main dialects
2. (Social Science / Peoples) (Linguistics / Languages) a native or inhabitant of Friesland or a speaker of the Frisian language
adj
a. (Linguistics / Languages) (Social Science / Peoples) of or relating to the Frisian language or its speakers
b. (Placename) (Linguistics / Languages) (Social Science / Peoples) of or relating to Friesland or its peoples and culture