BT Ḥul 58a(21) :הני ביעי דספק טר׳ דשיחלא קמא משהינן להו, אי הדרא ברי{{ה}}^א^ וטעינא שריין‏ : those eggs of a bird of doubtful status, we leave aside the first clutch; but if it is still healthy and has laid again, they are permitted
See the entire entry for ṭˁn vb. to carry