21.—(1) The Secretary of State shall trace all milk, milk products, meat, meat products, carcases, hides and skins, wool, semen, ova and embryos derived or collected from susceptible animals originating on infected premises.
(2) After tracing any semen, ovum or embryo, the Secretary of State shall, by notice served on the owner, or if that person is not readily ascertainable, the person in charge of it, direct that person to arrange for its disposal.
(3) After tracing any other item referred to in paragraph (1), the Secretary of State shall, by notice served on its owner, or if the owner is not readily ascertainable the person in charge of it, direct the owner or that person to either—
(a)arrange for such treatment as the Secretary of State considers necessary to ensure the destruction of the disease virus; or
(b)arrange for its disposal.