Cal. Civ. Code § 3062

Every owner or person having in charge any stallion, jack, or bull, used for propagating purposes, has a lien for the agreed price of its service upon any mare or cow and upon the offspring of such service, unless some willfully false representation concerning the breeding or pedigree of such stallion, jack, or bull has been made or published by the owner or person in charge thereof, or by some other person, at the request or instigation of such owner or person in charge.