Halakhah sur Shabbat 7:10

Most Rishonim understand that the Gemara's use of the term chayav clearly indicates that mefareik is a biblical prohibition. A minority view, held most notably by the Rashba (Shabbat 95a s.v. Choleiv), believes that milking is merely a rabbinical prohibition.³This view is based on the Talmud Yerushalmi (Shabbat 7:2).