Abu Hurairah (may Allah be pleased with him) narrates from the Messenger of Allah (peace be upon him) that he said: "There is no obligatory zakat on a slave except for the zakat of Fitr."
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صدقة المواشي من الإبل والبقر والغنم / 2289